Graph theory Mathematics 27 Combinatorial analysis 11 Dissertations, Academic (Ph.D) 8 Thesis (Ph.D)-Mathematics 8 Algorithms 5 Directed graphs 5 MATHEMATICS / Combinatorics 5 COMPUTERS / Operating Systems / General 4 Computer science 4 Matrices 4 Algebra 3 Algebraic topology 3 Data processing 3 MATHEMATICS / Advanced 3 System analysis 3 Combinatorial optimization 2 Congresses 2 Convex domains 2 Electric networks 2 Engineering 2 Functions, Zeta 2 Graphic methods 2 Polycyclic groups 2 Rings (Algebra) 2 Solvable groups 2 Topological graph theory 2 Trees (Graph theory) 2 Addresses, essays, lectures 1 Algebraic systems 1