Classification
EHA - Renewable energy sources
EXA - Energy policy
8
EVN - Energy supply - future aspects
7
EBA - Energy production, energy technology
6
EVA - Energy demand, energy supply - comprehensive works
5
TEJ - Electric devices, mechanical devices, magnets, dielectrics
5
CNWK - Electric batteries
4
ENA - Energy from biomass and waste
4
EVP - Energy models, energy system analysis
4
FJB - Electric materials
4
UEF - Sustainability
4
UKE - Environment and energy resources
4
EAD - Energy - comprehensive works
3
EIA - Solar energy - general
3
EKA - Wind energy
3
EWA - Energy economy
3
AFG - Large scale research institutions (Helmholtz Centres)
2
CNW - Electrochemical energy production and conversion
2
ETC - Energy conversion
2
LEL - Botany - lower plants
2
LTN - Biotechnology - biodegradation
2
TED - Electric power - industrial aspect
2
CHXP - Thermochemistry
1
CXA - Coal and fossil fuel - chemistry and technology
1
CXR - Natural gas and petroleum - chemistry and technology
1
CXRU - Synthetic fuels
1
EAA - Energy - reference books
1
ECA - Energy resources
1
EEA - Coal - general
1
EIP - Photovoltaics
1
EIS - Solar cells
1
ELA - Geothermal energy
1
EMA - Hydroelectric, tidal energy
1
ETA - Energy storage
1
FNF - Polymer science - general aspects
1
FNX - Carbon, carbon materials
1
MWE - Decision theory, game theory
1
TEDD - Electric power transmission
1
TGN - Control engineering
1
UCEA - Environmental impact
1
UHCH - Urban areas
1
UKA - Environmental damage and energy production
1
UKB - Environmental effects and energy
1
YPB - Economy - general aspects
1
YPGK - Marketing
1
YRD - Technology assessment
1