Xiaoge Zhang An Efficient Physarum Algorithm for Solving the Bicriteria Traffic Assignment Problem. 473-490 2015 11 Int. J. Unconv. Comput. 5-6 http://www.oldcitypublishing.com/journals/ijuc-home/ijuc-issue-contents/ijuc-volume-11-number-5-6-2015/ijuc-11-5-6-p-473-490/ db/journals/ijuc/ijuc11.html#Zhang15