Ioannis Caragiannis Afonso Ferreira Christos Kaklamanis Stephane Perennes Pino Persiano Hervé Rivano Approximate constrained bipartite edge coloring. 54-61 2004 143 Discrete Applied Mathematics 1-3 http://dx.doi.org/10.1016/j.dam.2003.12.006 db/journals/dam/dam143.html#CaragiannisFKPPR04