Gopala Krishna, J. 1965. Relations between the Growths of an Increasing f(x) and f<SUP>z</SUP> f(t)lt dt and Applications to Entire Functions. The Journal of the Indian Mathematical Society. 29, 1-2 (Jun. 1965), 49–61. DOI:https://doi.org/10.18311/jims/1965/16822.