Stochastic differential equations driven by generalized grey noise
  In this paper we establish a substitution formula for stochastic differential equation driven by generalized grey noise. We then apply this formula to investigate the absolute continuity of the solution with respect to the Lebesgue measure and the positivity of the density. Finally, we derive an upper bound and show the smoothness of the density. 
Jos\'e Lu\'is da Silva and Mohamed Erraoui
math.PR