S. Costea, M. Miranda Jr:
Newtonian Lorentz Metric Spaces
Illinois Journal of Mathematics Vol. 56, N. 2, p. 579-616, 2012

S. Costea:
Sobolev-Lorentz spaces in the Euclidean setting and counterexamples
Nonlinear Analysis: Theory, Methods & Applications Vol. 152, p. 149-182, 2017

S. Costea:
Sobolev-Lorentz capacity and its regularity in the Euclidean setting
Annales Academiae Scientiarum Fennicae Mathematica Vol. 44, p. 537-568, 2019