31. It was the first paper containing ( correct ) results explicitly in graph theory . 32. Walikar is well known for his work in connected dominating set in graph theory . 33. In topological graph theory there are several definitions of the genus of a group. 34. Tutte s research in the field of graph theory proved to be of remarkable importance. 35. The notion in graph theory that corresponds to induced substructures is that of induced subgraphs. 36. Choudum has guided 10 PhD students in graph theory . 37. Tree decomposition is a well-known concept from graph theory . 38. The two areas that interest him most are extremal graph theory and random graph theory . 39. The two areas that interest him most are extremal graph theory and random graph theory. 40. His research interests include graph theory and flow networks.
