TY - JOUR AU - Hain, Richard M. TI - On a generalization of Hilbert's 21st problem JO - Annales scientifiques de l'École Normale Supérieure PY - 1986 DA - 1986/// SP - 609 EP - 627 VL - Ser. 4, 19 IS - 4 PB - Elsevier UR - http://archive.numdam.org/articles/10.24033/asens.1520/ UR - https://zbmath.org/?q=an%3A0616.14004 UR - https://www.ams.org/mathscinet-getitem?mr=89a:14013 UR - https://doi.org/10.24033/asens.1520 DO - 10.24033/asens.1520 LA - en ID - ASENS_1986_4_19_4_609_0 ER -