TY - JOUR AU - M. B. Sheftel TI - Method of Group Foliation, Hodograph Transformation, and Noninvariant Solutions of the Heavenly Equation JO - Teoretičeskaâ i matematičeskaâ fizika PY - 2003 SP - 457 EP - 468 VL - 137 IS - 3 UR - http://geodesic.mathdoc.fr/item/TMF_2003_137_3_a11/ LA - ru ID - TMF_2003_137_3_a11 ER -