Apostol, T. M. 数论中的模函数和狄利克雷级数,第二版。 New York: Springer-Verlag, 1997.Hardy, G. H. 拉马努金:关于他生平和工作启发的课题的十二讲,第三版。 New York: Chelsea, 1999.Keiper, J. "On the Zeros of the Ramanujan -Dirichlet Series in the Critical Strip." Math. Comput.65, 1613-1619, 1996.Spira, R. "Calculation of the Ramanujan Tau-Dirichlet Series." Math. Comput.27, 379-385, 1973.Yoshida, H. "On Calculations of Zeros of L-Functions Related with Ramanujan's Discriminant Function on the Critical Line." J. Ramanujan Math. Soc.3, 87-95, 1988.