Classification
MFD - Group theory, representation theory
181
MSD - Mathematical methods in physics
64
FCDE - Symmetry in condensed matter
19
PKC - Elementary particles, nuclei - general theory
16
MFE - Algebras
15
MIDB - Algebraic topology
10
MAF - Mathematics - general series
9
CAN - Chemistry - mathematical methods, computer applications
8
MFC - Algebraic structures
8
MFCC - Algebraic fields, rings, ideals, valuations
8
MGC - Differential geometry
6
MSB - Chaos, nonlinear dynamical systems
6
PBB - Quantum theory - special methods
6
PKA - Elementary particles, nuclei - general
6
MIDC - Topological manifolds
5
PKN - Nuclear structure
5
CHO - Electronic structure of molecules, molecular orbitals, ligand field theory
4
CUA - Spectroscopy
4
FAF - Materials research - comprehensive works
4
FAM - Solid state physics - general theory
4
FAN - Solid state physics - mathematical methods, computer applications
4
FCG - Lattice dynamics
4
MGB - Algebraic geometry
4
PKK - Theory of fields and particles - general
4
PKKA - Quantum field theory
4
CUP - Vibrational spectroscopy
3
MEA - Number theory - general
3
MFBB - Matrices
3
MFCD - Algebraic lattices
3
MLF - Fourier analysis
3
MRB - Special functions, special polynomials
3
MRC - Vector analysis, tensor analysis
3
PAM - Physics - miscellaneous topics
3
PBA - Quantum theory
3
PBG - Relativity, gravitation
3
PKKG - Gauge field theory
3
CH - Physical chemistry
2
CHJ - Molecular physics, molecular structure
2
CHNK - Quantum chemistry - special aspects
2
FAAA - Crystallography - reference books
2
FCD - Crystal physics
2
FECB - Phase transitions
2
FJCB - Energy bands and electronic transport in solids
2
FKGD - Specific magnetic materials
2
MAK - Mathematics - formulae, tables
2
MDF - Formal languages, coding theory
2
MFAA - Combinations, graphs, tournaments
2
MFB - Linear algebra
2
MFCF - Semigroups, categories, functors
2
MIDA - Analytical topology
2
more ...