1. Ramanujan S: On certain arithmetical functions. Trans. Cambridge Philos. Soc. 1916, 22: 159–184.
2. Ramanujan S: Collected Papers. Am. Math. Soc., Providence; 2000.
3. II;JG Huard,2002
4. Lahiri DB:On Ramanujan’s function
τ
(
n
)
and the divisor function
σ
k
, I. Bull. Calcutta Math. Soc. 1946, 38: 193–206.
5. Glaisher JWL: On certain sums of products of quantities depending upon the divisors of a number. Mess. Math. 1885, 15: 1–20.