Physical Review A
It has been shown recently that one can construct a local relativistic quantum field theory which admits small violations of the Pauli exclusion principle by introducing paronic states which obey para-Fermi statistics of order 2. Paronic shifts are calculated for the low-lying states of helium to aid in the design of experiments either to detect paronic helium, or place upper limits on its possible existence. © 1989 The American Physical Society.
Drake, Gordon W. F.. (1989). Predicted energy shifts for paronic helium. Physical Review A, 39 (2), 897-899.