Vincenzo Bonifaci Kurt Mehlhorn Girish Varma Physarum can compute shortest paths. 233-240 2012 SODA https://doi.org/10.1137/1.9781611973099.21 https://dl.acm.org/citation.cfm?id=2095137 conf/soda/2012 db/conf/soda/soda2012.html#BonifaciMV12