TY - JOUR AU - G. Czichowski AU - M. Thiede TI - Standard Forms of Differential Equations and Symmetry Computation JO - Journal of Lie theory PY - 1992 SP - 223 EP - 234 VL - 2 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/JLT_1992_2_2_a10/ ID - JLT_1992_2_2_a10 ER -