Classification
E
3
ETF - Fuel cells - general
2
TKH - Air flight, space flight
2
ATEA - Information storage and retrieval
1
CWE - Chemical engineering, chemical industry - general
1
DYA - Artificial intelligence
1
ECA - Energy resources
1
GMP - Geochemical exploration
1
GWA - Raw material economy, raw material policy
1
ZCD - Information retrieval
1