21. Equals their maximum degree, is equivalent to the perfection of the line graphs of bipartite graphs . 22. Every bipartite graph is of class 1, and almost all random graphs are of class 1. 23. :: : If I remember my graph theory right, this is also a Bipartite graph . 24. This bound has been conjectured to be the optimal number of crossings for all complete bipartite graphs . 25. A bipartite graph can be extended to a complete bipartite graph by adding artificial edges with large weights. 26. A bipartite graph can be extended to a complete bipartite graph by adding artificial edges with large weights. 27. The Dulmage Mendelsohn decomposition is a structural decomposition of bipartite graphs that is useful in finding maximum matchings. 28. Hereditary maximal-clique irreducible graphs include triangle-free graphs, bipartite graphs , and interval graphs. 29. The codes are based on double cover d, regular expander G, which is a bipartite graph . 30. Initially, the incidence chromatic number of trees, complete bipartite graphs and complete graphs was found out.