Classification
PKKI - Theory of strings
2
AMA - Education - general
1
PKA - Elementary particles, nuclei - general
1
PKK - Theory of fields and particles - general
1
PKKG - Gauge field theory
1
PKL - Elementary particles - interactions, reactions, resonances
1
PKLB - Elementary particles - specific theories, interaction models
1
PLA - Astrosciences - general
1