Long, Shude

• The Electronic Journal of Combinatorics Volume 21, Issue 2 (2014) - Papers
  Counting 2-Connected 4-Regular Maps on the Projective Plane
  Abstract  PDF  Counting 2-Connected 4-Regular Maps on the Projective Plane  Counting 2-Connected 4-Regular Maps on the Projective Plane  Counting 2-Connected 4-Regular Maps on the Projective Plane  source file (from imw)  Official source