Sharp essential self-adjointness of relativistic Schr\"odinger operators   with a singular potential
  This paper is devoted to the study of essential self-adjointness of a relativistic Schr\"{o}dinger operator with a singular homogeneous potential. From an explicit condition on the coefficient of the singular term, we provide a sufficient and necessary condition for essential self-adjointness. 
Mouhamed Moustapha Fall and Veronica Felli
math.AP