Classification
EXA - Energy policy
12
EHA - Renewable energy sources
9
EPK - Nuclear energy
6
EUA - Energy conservation - general
6
UKH - Environment and power plants, industrial plants
3
YPB - Economy - general aspects
3
EAE - Energy - general
2
EFA - Petroleum, natural gas
2
ETC - Energy conversion
2
EUR - District heating
2
EVB - Energy supply of Germany
2
EWA - Energy economy
2
UCL - Environmental research
2
CXME - Fossil fuel residues - fly ash, coal ash
1
EFP - Petroleum production, natural gas production
1
EIA - Solar energy - general
1
EIP - Photovoltaics
1
EUC - Energy conservation - civil engineering
1
EUU - Cogeneration
1
EVA - Energy demand, energy supply - comprehensive works
1
GWB - Raw materials - metals, nonmetals
1
LGM - Zoology - Protozoa
1
MSU - Economic analysis
1
THI - Robotics
1
THS - Turbines, pumps
1
TNA - Nuclear engineering - general
1
TNOE - Nuclear reactor site
1
TNQ - Nuclear reactor operation, control, measurement
1
UA - Environment - general
1
UCQ - Environmental technology
1
UEG - Environmental programs and expertises
1
UKA - Environmental damage and energy production
1
UKB - Environmental effects and energy
1
UKE - Environment and energy resources
1
UMEE - Clean air planning
1
UMGD - Clean air technology in fossil fuel and industrial plants
1
UMK - Air pollution - general aspects
1
UML - Air pollution by special sources
1
UMLE - Air pollution by power plants and industrial plants
1
USDE - Domestic waste, plastics, paper
1
UVFD - Environmental aspects of specific heavy metals - cadmium, lead, mercury
1
YPM - National economy
1