Generalizations of the Dirac equation in covariant and Hamiltonian form
Loide, Rein-Karl
;
Ots, I.
;
Saar, R.
Journal of physics A : mathematical and general
2001
/
p. 2031-2039
https://iopscience.iop.org/article/10.1088/0305-4470/34/10/307