Dirac operator with linear potential and its perturbations
  We prove that canonical Dirac expression with linear potential generates operators on axis and half axis, for which we can find the eigenvalues and eigenfunctions in explicit form. We construct the perturbations of these operators with in advance given spectra. 
Yuri A. Ashrafyan, Tigran N. Harutyunyan
math.SP math-ph math.MP