Exact Enumeration of Rooted 3-connected Triangular Maps on the Projective Plane (Extended Abstract).

Zhicheng Gao Jianyu Wang Exact Enumeration of Rooted 3-connected Triangular Maps on the Projective Plane (Extended Abstract). 30-33 2001 7 Electronic Notes in Discrete Mathematics http://dx.doi.org/10.1016/S1571-0653(04)00217-3 db/journals/endm/endm7.html#GaoW01