The crossing number of the generalized Petersen graph P(10, 3) is six
  The crossing number of a graph is the least number of crossings of edges among all drawings of the graph in the plane. In this article, we prove that the crossing number of the generalized Petersen graph P(10, 3) is equal to 6. 
Yuansheng Yang, Baigong Zheng, Xirong Xu
cs.DM math.CO