05-00 General reference works (handbooks, dictionaries, bibliographies, etc.) pertaining to combinatorics 26
05B10 Combinatorial aspects of difference sets (number-theoretic, group-theoretic, etc.) [See also 11B13] 1778
05C60 Isomorphism problems in graph theory (reconstruction conjecture, etc.) and homomorphisms (subgraph embedding, etc.) 3227
05C62 Graph representations (geometric and intersection representations, etc.) {For graph drawing, see also 68R10} 2662
05C70 Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.) 13183
05D40 Probabilistic methods in extremal combinatorics, including polynomial methods (combinatorial Nullstellensatz, etc.) 541