Classification
EBA - Energy production, energy technology
18
EHA - Renewable energy sources
3
CNW - Electrochemical energy production and conversion
2
CNWK - Electric batteries
2
EUA - Energy conservation - general
2
FJB - Electric materials
2
TEJ - Electric devices, mechanical devices, magnets, dielectrics
2
ECA - Energy resources
1
ETC - Energy conversion
1
TED - Electric power - industrial aspect
1