@article{ASENS_1986_4_19_4_609_0, author = {Hain, Richard M.}, title = {On a generalization of {Hilbert's} 21st problem}, journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure}, pages = {609--627}, publisher = {Elsevier}, volume = {Ser. 4, 19}, number = {4}, year = {1986}, doi = {10.24033/asens.1520}, zbl = {0616.14004}, mrnumber = {89a:14013}, language = {en}, url = {http://archive.numdam.org/articles/10.24033/asens.1520/} }