TY - JOUR AU - G. Czichowski TI - A Lie Theory of Differential Equations and Computer Algebra JO - Journal of Lie theory PY - 1991 SP - 083 EP - 092 VL - 1 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/JLT_1991_1_1_a8/ ID - JLT_1991_1_1_a8 ER -