@article{PHSC_1996__1_4_85_0,
     author = {Gropp, Harald},
     title = {Poincar\'e and graph theory},
     journal = {Philosophia Scientiae},
     pages = {85--95},
     publisher = {\'Editions Kim\'e},
     volume = {1},
     number = {4},
     year = {1996},
     language = {en},
     url = {http://www.numdam.org/item/PHSC_1996__1_4_85_0/}
}