TY - JOUR AU - A. V. Tsiganov TI - Two integrable systems with integrals of motion of degree four JO - Teoretičeskaâ i matematičeskaâ fizika PY - 2016 SP - 443 EP - 455 VL - 186 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_2016_186_3_a6/ LA - ru ID - TMF_2016_186_3_a6 ER -