Classification
ELA - Geothermal energy
51
GKAB - Geothermics
8
GKKF - Geothermic methods
5
EHA - Renewable energy sources
3
EIA - Solar energy - general
2
ENA - Energy from biomass and waste
2
GKK - Geophysics - applications
2
CHXP - Thermochemistry
1
EBA - Energy production, energy technology
1
EIC - Solar thermal energy conversion
1
EIP - Photovoltaics
1
EKA - Wind energy
1
EMA - Hydroelectric, tidal energy
1
ETA - Energy storage
1
EUC - Energy conservation - civil engineering
1
GKKA - Geophysical well logging
1
TKD - Air conditioning, refrigeration
1
UKE - Environment and energy resources
1