1 “... Mathematician Julius Petersen in 1891, is often considered the first strictly theoretical paper dealing...”

2 “... connection to the four color theorem is described to aid mathematicians to initiate new methods...”

3 “...-known mathematicians who were involved in these problems. The concepts of different spanning walks...”

4 “... is primarily mathematicians interested in learning some new areas of graph colorings as well as researchers...”

5 “... mathematicians, and which could be developed into independent handbooks. The 89 contributors to this volume, 31...”