Convolutions of long-tailed and subexponential distributions
  Convolutions of long-tailed and subexponential distributions play a major role in the analysis of many stochastic systems. We study these convolutions, proving some important new results through a simple and coherent approach, and showing also that the standard properties of such convolutions follow as easy consequences. 
Sergey Foss, Dmitry Korshunov and Stan Zachary