David Applegate, Robert Bixby, Vasek Chvátal and William Cook On the Solution of Traveling Salesman Problems Doc.Math.J.DMV Extra Volume ICM III (1998) 645-656 Abstract 2 k, dvi.gz 23 k, dvi 53 k, ps.gz 68 k. Michel X. Goemans Semidefinite Programming and Combinatorial Optimization Doc.Math.J.DMV Extra Volume ICM III (1998) 657-666 Abstract 2 k, dvi.gz 22 k, dvi 48 k, ps.gz 72 k. Richard H. Byrd and Jorge Nocedal Active Set and Interior Methods for Nonlinear Optimization Doc.Math.J.DMV Extra Volume ICM III (1998) 667-676 Abstract 2 k, dvi.gz 16 k, dvi 37 k, ps.gz 53 k. Ranga Anbil, John J. Forrest and William R. Pulleyblank Column Generation and the Airline Crew Pairing Problem Doc.Math.J.DMV Extra Volume ICM III (1998) 677-686 Abstract 2 k, dvi.gz 18 k, dvi 43 k, ps.gz 52 k. Alexander Schrijver Routing and Timetabling by Topological Search Doc.Math.J.DMV Extra Volume ICM III (1998) 687-695 Abstract 2 k, dvi.gz 17 k, dvi 39 k, ps.gz 64 k. Jan C. Willems Open Dynamical Systems and their Control Doc.Math.J.DMV Extra Volume ICM III (1998) 697-706 Abstract 2 k, dvi.gz 19 k, dvi 45 k, ps.gz 67 k. This manuscript may contain graphics, therefore the dvi files may be incomplete. Michal Kocvara and Jochem Zowe Free Material Optimization Doc.Math.J.DMV Extra Volume ICM III (1998) 707-716 Abstract 2 k, dvi.gz 16 k, dvi 35 k, ps.gz 102 k. This manuscript may contain graphics, therefore the dvi files may be incomplete.