Van Den Essen, Arno A remark on the invariants of Gerard-Levelt for holonomic D1 - modules - Nijmegen : Catholic University, Department of Mathematics, 1988. - 7p. ; 21cm. - Report 8826 . Includes bibliographical references Subjects--Topical Terms: Holonomy groups InvariantsModules (algebras) LC Class. No.: QA3.R46 no.8826