Bull. Korean Math. Soc. 2018; 55(5): 1621-1625
Online first article July 3, 2018 Printed September 1, 2018
https://doi.org/10.4134/BKMS.b170955
Copyright © The Korean Mathematical Society.
Eric Hofmann, Winfried Kohnen
Universit\"at Heidelberg, Universit\"at Heidelberg
© 2022. The Korean Mathematical Society. Powered by INFOrang Co., Ltd