Kha Zui Khoai, “p-adic L-function associated with an elliptic curve”, Mathematical Notes of the Academy of Sciences of the USSR, 26, no. 2, 1979, 629
SHINJI FUKUHARA, YIFAN YANG, “Period polynomials and explicit formulas for Hecke operators on Γ0(2)”, Math. Proc. Camb. Phil. Soc., 146, no. 2, 2009, 321
V. A. Bykovskii, “Generating Elements of the Annihilating Ideal for Modular Symbols”, Functional Analysis and Its Applications, 37, no. 4, 2003, 263