@incollection{Groetschel1984, author = {Martin Gr{\"o}tschel}, title = {Developments in combinatorial optimization}, booktitle = {Perspectives in Mathematics (Anniversary of Oberwolfach 1984)}, editor = {Willi J{\"a}ger and J. Moser and R. Remmert}, pages = {249 -- 294}, year = {1984}, }