@article{AIF_1999__49_3_973_0,
     author = {Las Vergnas, Michel},
     title = {The {Tutte} polynomial of a morphism of matroids {I.} {Set-pointed} matroids and matroid perspectives},
     journal = {Annales de l'Institut Fourier},
     pages = {973--1015},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {49},
     number = {3},
     year = {1999},
     doi = {10.5802/aif.1702},
     mrnumber = {2000f:05024},
     zbl = {0917.05019},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.1702/}
}