Consistent nonadditive approach and nuclear equation of state
  By using a $q$-calculus, the Walecka many-body field theory was studied in the context of the Tsallis framework.   The most important aspect of the application of the $q$-calculus to the nonadditive formulation of QHD-I is that it naturally emerges as a thermodynamically consistent theory. 
A. P. Santos, F. I. M. Pereira, R. Silva, J. S. Alcaniz
nucl-th