%0 Journal Article %A Houard, J. C. %A Irac-Astaud, M. %T Star algebra and Green functions of nonlinear differential equations %J Annales de l'I.H.P. Physique théorique %D 1985 %P 1-27 %V 43 %N 1 %I Gauthier-Villars %U http://www.numdam.org/item/AIHPA_1985__43_1_1_0/ %G en %F AIHPA_1985__43_1_1_0