@article{CMH_1957__32_139149,
     author = {J. Delsarte and J.L. Lions},
     title = {Transmutations d'op\'erateurs diff\'erentiels dans le domaine complexe.},
     journal = {Commentarii mathematici Helvetici},
     pages = {113--128},
     publisher = {mathdoc},
     volume = {32},
     year = {1957},
     zbl = {0080.29501},
     url = {http://geodesic.mathdoc.fr/item/CMH_1957__32_139149/}
}