PageHeader : Funkcialaj Ekvacioj, 33 (1990) 1?17 Title : On the Formal Fundamental Solution of a Differential Title : Equation Depending on a Parameter AuthorInfo : By AuthorInfo : R. SCHAFKE and H. VOLKMER AuthorInfo : (Universitat Essen-GHS, West Germany) section : 0. Introduction section : 1. Reduction of (0.1) by algebraic methods section : 2. On the growth order section : Appendix: Some lemmas from algebra section : References