The (A)symmetry between the Exterior and Interior of a Schwarzschild Black Hole. - Pawel Gusin; Andy T. Augousti; Filip Formalik; Andrzej Radosz (Symmetry, 2018)

The Symmetry of the Interior and Exterior of Schwarzschild and Reissner-Nordstrom Black Holes - Sphere vs. Cylinder. - Andy T. Augousti; Andrzej Radosz; Pawel Gusin; Aleksander Kaczmarek (Symmetry, 2020)

Unbounded Energy Collisions inside and outside Black Holes. - Andy T. Augousti; Pawel Gusin; Andrzej Radosz; Romuald J. Sciborski (Symmetry, 2022)