Soviet Rail Network,1955 G5 幽 蹈韶奥 ®6 2 蝇 5 8 o大 ⑧ 2 3 ORIGINS Reference:On the history of the transportation and maximum flow problems. Alexander Schrijver in Math Programming,91:3,2002. 22 Soviet Rail Network, 1955 Reference: On the history of the transportation and maximum flow problems. Alexander Schrijver in Math Programming, 91: 3, 2002