Abstract
Saito, N.; T. Nishizeki (eds.): Graph Theory and Algorithms. Proceedings of the 17th symposium of Research Institute of Electrical Communication, Tohoku University Sendai, Japan. October 24-25, 1980. Lecture Noter in Computer Seience, Vol. 108. Springer- Verlag, Berlin, Heidelberg, New york 1981, VI - 216 S., 73 Abb., DM 25.