@article{PSMIR_1978___3_A2_0,
     author = {Bolley, P. and Camus, J.},
     title = {Powers and {Gevrey's} {Regularity} for a {System} of {Differential} {Operators}},
     journal = {Publications des s\'eminaires de math\'ematiques et informatique de Rennes},
     note = {talk:2},
     pages = {1--21},
     publisher = {D\'epartement de Math\'ematiques et Informatique, Universit\'e de Rennes},
     number = {3},
     year = {1978},
     language = {en},
     url = {http://archive.numdam.org/item/PSMIR_1978___3_A2_0/}
}