@article{ASENS_1972_4_5_3_423_0,
     author = {Flato, M. and Simon, J. and Snellman, H. and Sternheimer, D.},
     title = {Simple facts about analytic vectors and integrability},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {423--434},
     publisher = {Elsevier},
     volume = {Ser. 4, 5},
     number = {3},
     year = {1972},
     doi = {10.24033/asens.1233},
     mrnumber = {51 #13135},
     zbl = {0239.22019},
     language = {en},
     url = {http://archive.numdam.org/articles/10.24033/asens.1233/}
}