D. Bertrand, “Multiplicity and vanishing lemmas for differential and $q$-difference equations in the Siegel–Shidlovsky theory”, Fundam. Prikl. Mat., 16:5 (2010), 19–30; J. Math. Sci., 180:5 (2012), 542–549
D. Bertrand, W. V. Zudilin, “Derivatives of Siegel modular forms and exponential functions”, Izv. RAN. Ser. Mat., 65:4 (2001), 21–34; Izv. Math., 65:4 (2001), 659–672
