@article{DIA_1989__21__A1_0,
     author = {DIA},
     title = {14 juillet 1989 : un anniversaire},
     journal = {Diagrammes},
     note = {talk:1},
     pages = {1--2},
     publisher = {Universit\'e Paris 7, Unit\'e d'enseignement et de recherche de math\'ematiques},
     volume = {21},
     year = {1989},
     language = {fr},
     url = {http://archive.numdam.org/item/DIA_1989__21__A1_0/}
}