Classification
EHA - Renewable energy sources
ENA - Energy from biomass and waste
19
EXA - Energy policy
14
EBA - Energy production, energy technology
12
ETC - Energy conversion
9
EVA - Energy demand, energy supply - comprehensive works
7
EVN - Energy supply - future aspects
7
LTN - Biotechnology - biodegradation
7
EKA - Wind energy
6
UKE - Environment and energy resources
6
EUA - Energy conservation - general
5
EVB - Energy supply of Germany
5
EVP - Energy models, energy system analysis
5
EWA - Energy economy
5
LTE - Biotechnology - general aspects
5
UEF - Sustainability
5
ECA - Energy resources
4
EIA - Solar energy - general
4
EMA - Hydroelectric, tidal energy
4
LEL - Botany - lower plants
4
UKA - Environmental damage and energy production
4
CWE - Chemical engineering, chemical industry - general
3
CXX - Hydrogen production - chemistry and technology
3
ELA - Geothermal energy
3
ESB - Hydrogen energy
3
EYA - Energy problems of developing countries
3
LHL - Microbiology - general aspects
3
LRR - Tissue cultures, cell cultures
3
LTD - Biotechnology - comprehensive works
3
LTT - Enzyme technology, protein engineering
3
LTU - Genetic engineering
3
TEJ - Electric devices, mechanical devices, magnets, dielectrics
3
AFG - Large scale research institutions (Helmholtz Centres)
2
CNW - Electrochemical energy production and conversion
2
CNWK - Electric batteries
2
CXRU - Synthetic fuels
2
EAA - Energy - reference books
2
EAD - Energy - comprehensive works
2
EEA - Coal - general
2
EFA - Petroleum, natural gas
2
FJB - Electric materials
2
LWE - Agriculture - general aspects
2
TED - Electric power - industrial aspect
2
TEDD - Electric power transmission
2
UA - Environment - general
2
UHK - Traffic and environment - incl. automobile exhaust gas
2
UMV - Climatic change
2
YEN - Atomic energy law
2
YPB - Economy - general aspects
2
AJA - Directories - general
1
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