1. Methodology for the calculation of long-term passenger flow;Dynkin,1966
2. An algorithm for computing interzonal transfers using the gravity model;D'esopo;Oper. Res.,1963
3. A relationship between arbitrary positive matrices and doubly stochastic matrices;Sinkhorn;Ann. mat. Stat.,1964
4. Proximity maps for convex sets;Cheney,1959
5. Finding the common point of convex sets by successive projection;Bregman;Dokl. Akad. Nauk SSSR,1965