In this paper, we give lower bounds for $\int_0^H \vert F(it)\vert^k\,dt$, where $k=1$ or $2$ and $F(s)$ is a Dirichlet series of a certain kind. Since the conditions on $F(s)$ are relaxed, the bounds are somewhat smaller than those obtained previously.
R. Balasubramanian;K. Ramachandra, 1992, On the zeros of a class of generalised Dirichlet series-X, Indagationes Mathematicae, 3, 4, pp. 391-402, 10.1016/0019-3577(92)90018-g.