TY - BOOK AU - Bluman,G.W & Anco,S.C ED - Anco, S.C TI - Symmetry & integration methods for differential equations T2 - Applied mathematical sciences 154 SN - 0-387-98654-5 U1 - 10.13+11.07+9.02 PY - 2002/// CY - New York PB - Springer ER -