Some General Aspects of the Framing Number of a Digraph.

Michael A. Henning Hiren Maharaj Some General Aspects of the Framing Number of a Digraph. 115-133 1998 82 Discrete Applied Mathematics 1-3 http://dx.doi.org/10.1016/S0166-218X(97)00127-3 db/journals/dam/dam82.html#HenningM98