@article{MSH_1991__116__5_0,
     author = {Ginisti, Jean-Pierre},
     title = {The problems of definition},
     journal = {Math\'ematiques informatique et sciences humaines},
     pages = {5--22},
     publisher = {Ecole des hautes-\'etudes en sciences sociales},
     volume = {116},
     year = {1991},
     mrnumber = {1167759},
     zbl = {0794.03006},
     language = {en},
     url = {http://www.numdam.org/item/MSH_1991__116__5_0/}
}