[1]
GUIDORlZZI, H.L. 1996. THE FAMILY OF FUNCTIONS $S_{\alpha, k}$ AND THE LIENARD EQUATION. Tamkang Journal of Mathematics. 27, 1 (Mar. 1996), 37–54. DOI:https://doi.org/10.5556/j.tkjm.27.1996.4368.