TY - JOUR AU - Valery Dryuma TI - Four-dimensional Ricci-flat space defined by the KP-equation JO - Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica PY - 2008 SP - 108 EP - 111 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/BASM_2008_3_a11/ LA - en ID - BASM_2008_3_a11 ER -