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	1.	No cover image available No cover image available No cover image available Irregular singularities in several variable formal theory in the umixed case by Van Den Essen, Arno [Author] A. H. M. Levelt [Author] Series: Report 8015 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Nijmegen : Catholic University, Department of Mathematics 1980 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: Science and Engineering Collection QA3.R46. Place hold Add to cart (remove)
	2.	No cover image available No cover image available No cover image available An explicity description of all simple D - modules by Van de Essen, Arno [Author] A. H. M. Levelt [Author] Series: Report 9046 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Nijmegen : Catholic University, Department of Mathematics, 1990 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: Science and Engineering Collection QA3.R46 . Place hold Add to cart (remove)
	3.	No cover image available No cover image available No cover image available Stabilizing differential operators A. H. M. Levelt by Levelt, A. H. M [Author] Series: Report 8832 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Nijmegen : Catholic University, Department of Mathematics, 1988 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: Science and Engineering Collection QA3.R46 no.8832. Place hold Add to cart (remove)