In the first step, the search was carried out for cyanobacteria in a series of experimental search to obtain an optimal set of keywords for cyanobacterial research. The collated final sample of keywords for general cyanobacterial research is given below:

TI = (*aplysiatoxin or *cyanobact* or *cylindrospermopsin* or *lyngbya or *microcyst* or *phycocyanin* or “methylamino-l-alanine*” or “l-arginyl-poly-l-aspartate*” or “blue-green alga*” or “blue-green alga*” or “blue-green alga*” or allophycocyanin* or anatoxin* or aplysiatoxin* or apratoxin* or aeruginosin* or bmaa or calothrixin* or chroococcoid or cryptophycin* or curacin* or cyanobacter* or cyanobacteriochrome* or cyanobactin* or cyanofuel* or cyanoginosin* or cyanohab* or cyanophage* or cyanophycin* or cyanophyta* or cyanophyte* or cyanophyceae or cyanoprokaryote* or cyanotoxin* or cyanoviridin* or cyanovirin* or cylindrospermopsin* or debromoaplysiatoxin or dihydromicrocystin* or fischerindole* or hapalindole* or homoanatoxin* or lyngbyabellin* or lyngbyastatin* or lyngbyatoxin* or majusculamide* or microcyst* or nodularin* or nostocales or nostocyclamide or oscillatoxin* or patellamide* or phycobiliprotein* or phycobilisome* or phycocyanobilin* or phycobilin* or phycoerythrocyanin* or phycoerythrin or phycocyanin* or picocyanobacter* or prochlorophyta or prochlorophyte* or scytonemin or scytophycin* or scytovirin* or sphingosinicella* or spirulan* or venturamide* or welwitindolinone*) OR TI = (Acaryochloris or Agmenellum or Alkalinema or Anabaena or Anabaenopsis or Anacystis or Ancylothrix or Aphanizomenon or Aphanothece or Arthrospira or Brasilonema or Caldora or Calothrix or Cephalothrix or Coelosphaerium or Chlorogloeopsis or Chroococcidiopsis or Chroococcus or Chrysosporum or Coccochloris or Coelodesmium or Crocosphaera or Cuspidothrix or Cyanobium or Cyanothece or Cylindrospermopsis or Cylindrospermum or Desertifilum or Desmonostoc or Dolichospermum or Fischerella or Foliisarcina or Fremyella or Geitlerinema or Geminocystis or Gloeobacter or Gloeocapsa or Halomicronema or Hapalosiphon or Hassallia or Kryptousia or Leptolyngbya or Limnoraphis or Lyngbya* or Macrochaete or Mastigocladus or Microcoleus or Microcystis or Microseira or Moorea or Myxocarcina or Neolyngbya or Nodularia or Nostoc or Oscillatoria or Okeania or Phormidesmis or Phormidium or Phyllonema or Planktothrix or Plectonema or Potamolinea or Prochlorococcus or Prochloron or Prochlorothrix or Pseudanabaena or Radiocystis or Romeria or Raphidiopsis or Roseofilum or Scytonema or Sphaerospermopsis or Spirulina or Symploca or Synechococcus or Synechocystis or Thermoleptolyngbya or ThermoSynechococcus or Tolypothrix or Trichodesmium or Trichormus or Tychonema or Umezakia or Vampirovibrio or Westiella or Woronichinia).

In the second step, this sample of keywords was refined for the cyanobacterial bioenergy and biofuels research. In addition, a workable set of keywords to locate the papers related to cyanobacterial bioenergy and biofuels research was collated. These two sets of keywords are given below:

TI = (*cyanobact* or “blue-green alga*” or “blue-green alga*” or “blue-green alga*” or cyanobacter* or cyanofuel* or cyanophyta* or cyanophyte* or cyanophyceae or nostocales or patellamide* or picocyanobacter* or prochlorophyta or prochlorophyte*) OR TI = (Acaryochloris or Agmenellum or Alkalinema or Anabaena or Anabaenopsis or Anacystis or Ancylothrix or Aphanizomenon or Aphanothece or Arthrospira or Brasilonema or Caldora or Calothrix or Cephalothrix or Coelosphaerium or Chlorogloeopsis or Chroococcoid or Chroococcidiopsis or Chroococcus or Chrysosporum or Coccochloris or Coelodesmium or Crocosphaera or Cuspidothrix or Cyanobium or Cyanothece or Desertifilum or Desmonostoc or Dolichospermum or Fischerella or Foliisarcina or Fremyella or Geitlerinema or Geminocystis or Gloeobacter or Gloeocapsa or Halomicronema or Hapalosiphon or Hassallia or Kryptousia or Leptolyngbya or Limnoraphis or Macrochaete or Mastigocladus or Microcoleus or Microseira or Myxocarcina or Neolyngbya or Nostoc or Oscillatoria or Okeania or Phormidesmis or Phormidium or Phyllonema or Planktothrix or Plectonema or Potamolinea or Prochlorococcus or Prochloron or Prochlorothrix or Pseudanabaena or Radiocystis or Romeria or Raphidiopsis or Roseofilum or Sphaerospermopsis or Spirulina or Symploca or Synechococcus or Synechocystis or Thermoleptolyngbya or ThermoSynechococcus or Tolypothrix or Trichodesmium or Trichormus or Tychonema or Umezakia or Vampirovibrio or Westiella or Woronichinia)

TI = ((“fatty acid*” and production) or (hydrogen and (production or generation or metabolism or photoevolution or metabolism*)) or (lipid* and (production or extract* or convers*)) or *capacitor* or “algal oil*” or “anaerobic co-digestion” or “anaerobic digestion” or “bio-crude*” or “bio-oil*” or “catalytic conversion” or “energy storage” or “fuel cell*” or “gas production” or “life-cycle assessment” or “methane production” or “oil extraction” or “oil production” or “photo-bioreactor*” or “solar cell*” or “solar drying” or alkane* or batteries or battery or biobutanol or biochar* or biocrude or biodiesel or bioelectricity or bioenergy or bioethanol or biofuel* or biogas or biohydrogen or bioisobutanol or biomethanation or biomethane or *bioreactor* or biorefinery or biotechnology or butanediol or butanol or *electricity or ethanol or “ethanol synthesis” or fermentation or fermentative or fuel* or gasification or “h-2” or hydrocarbon* or hydrochar* or hydrogenase* or isobutyraldehyde or “isoprene production” or liquefaction or methanisation or photobioreactor* or ponds or pyrolysis or pyrolytic or saccharification or supercapacitor* or transester* or triacylglyceride* or triacylglycerol* or wastewater*)