@article{DBLP:journals/jacm/Ramakrishnan80,
author = {K. G. Ramakrishnan},
title = {Solving Two-Commodity Transportation Problems with Coupling
Constraints},
journal = {J. ACM},
volume = {27},
number = {4},
year = {1980},
pages = {736-757},
ee = {http://doi.acm.org/10.1145/322217.322227},
bibsource = {DBLP, http://dblp.uni-trier.de}
}