Here will be the PIP paper database, I will re-add all the paper references once it's done. Anyway, please think that it would be quite fair to refer the following paper in any publication that results from the use of the PIP software or its library :-) !
@Article{Fea88, author = {P. Feautrier}, title = {Parametric integer programming}, journal = {RAIRO Recherche Op\'erationnelle}, year = 1988, volume = 22, number = 3, pages = {243--268} }