On Lp -theory for parabolic and elliptic integro-differential equations   with scalable operators in the whole space
  Elliptic and parabolic integro-differential model problems are considered in the whole space. By verifying H\"ormander condition, the existence and uniqueness is proved in L_{p}-spaces of functions whose regularity is defined by a scalable, possibly nonsymmetric, Levy measure. Some rough probability density function estimates of the associated Levy process are used as well. 
R. Mikulevicius and C. Phonsom
math.AP math.PR