TY - JOUR AU - S. L. Tonkonog AU - L. D. Èskin TI - On the accuracy of approximate symmetries of equations of the dynamics of a non-Newtonian fluid and their invariant solutions.~I JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 2003 SP - 53 EP - 62 IS - 8 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_2003_8_a6/ LA - ru ID - IVM_2003_8_a6 ER -