Lopamudra Mukherjee Vikas Singh Jiming Peng Jinhui Xu Michael J. Zeitz Ronald Berezney Generalized Median Graphs: Theory and Applications. 1-8 2007 ICCV http://dx.doi.org/10.1109/ICCV.2007.4408966 conf/iccv/2007 db/conf/iccv/iccv2007.html#MukherjeeSPXZB07