Solving matching problems with linear programming. - Martin Grötschel; Olaf Holland (Math. Program., 1985)

A cutting plane algorithm for minimum perfect 2-matchings. - Martin Grötschel; Olaf Holland (Computing, 1987)

Schnittebenenverfahren für Travelling-Salesman- und verwandte Probleme. - Olaf Holland (1987)

Solution of large-scale symmetric travelling salesman problems. - Martin Grötschel; Olaf Holland (Math. Program., 1991)