TY - JOUR AU - Deveney, James K. AU - Finston, David R. TI - Fields of Ga Invariants are Ruled JO - Canadian mathematical bulletin PY - 1994 SP - 37 EP - 41 VL - 37 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1994-006-0/ DO - 10.4153/CMB-1994-006-0 ID - 10_4153_CMB_1994_006_0 ER -