@article{701449,
     title = {On mutational deformation retracts},
     booktitle = {Proceedings of the Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1989},
     pages = {[291]-293},
     mrnumber = {MR1009581},
     zbl = {0676.54023},
     url = {http://dml.mathdoc.fr/item/701449}
}

Sanjurjo, José M. R. On mutational deformation retracts, dans Proceedings of the Winter School "Geometry and Physics", GDML_Books,  (1989), pp. [291]-293. http://gdmltest.u-ga.fr/item/701449/