The crossing number of cubes with small order
  The {\it crossing number} of a graph $G$ is the minimum number of pairwise intersections of edges in a drawing of $G$. In this paper, we give the exact values of crossing numbers for some variations of hypercube with order at most four, including crossed cube, locally twisted cube and M\"{o}bius cube. 
Guoqing Wang, Haoli Wang, Yuansheng Yang
math.CO