@article{RO_1999__33_3_339_0,
     author = {Lerman, Isra\"el-C\'esar},
     title = {Comparing classification tree structures : a special case of comparing $q$-ary relations},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {339--365},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {3},
     year = {1999},
     mrnumber = {1721639},
     zbl = {0948.05023},
     language = {en},
     url = {http://www.numdam.org/item/RO_1999__33_3_339_0/}
}