“…The aim of this paper is to find the integrable cases of system (1.1) when s = 5 (see Theorem 1). The integrable cases for quadratic systems, s = 2, and cubic homogeneous systems, s = 3, have been studied by several authors Bautin [1], Chavarriga [2], Coppel [5], Lloyd [6], Lunkevich and Sibirskii [7], Schlomiuk [9] andŻoladek [13]. Some integrable cases of system (1.1) when s = 4 have been determinated by Chavarriga and Giné [4].…”