MR0904542 Praagman, C. C. PRAAGMAN Stokes and Gevrey phenomena in relation to index theorems in the theory of meromorphic linear difference equations Funkcialaj Ekvacioj. Serio Internacia 29 1986 259--279 http://fe.math.kobe-u.ac.jp/FE/Free/vol29/fe29-3-2.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE21-30-en_KML/fe29-259-279/fe29-259-279.pdf http://www.ams.org/mathscinet-getitem?mr=MR0904542 fe29-259-279 1986 Stokes and Gevrey Phenomena in Relation to Index Theorems in the Theory of Meromorphic Linear Difference Equations PRAAGMAN, C. PRAAGMAN, C.
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