@article{AIHPA_1967__6_2_89_0,
     author = {Pham, Fr\'ed\'eric},
     title = {Singularit\'es des processus de diffusion multiple},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {89--204},
     publisher = {Gauthier-Villars},
     volume = {6},
     number = {2},
     year = {1967},
     mrnumber = {214341},
     zbl = {0154.46102},
     language = {fr},
     url = {http://archive.numdam.org/item/AIHPA_1967__6_2_89_0/}
}