@article{IM2_2001_65_4_a1,
     author = {D. Bertrand and W. V. Zudilin},
     title = {Derivatives of {Siegel} modular forms and exponential functions},
     journal = {Izvestiya. Mathematics},
     pages = {659--672},
     year = {2001},
     volume = {65},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2001_65_4_a1/}
}