Causal structure of singularity in non-spherical gravitational collapse Dipanjan Dey, Pankaj S. Joshi, Karim Mosani and Vitalii Vertogradov Eur. Phys. J. C, 82 5 (2022) 431 Published online: 11 May 2022 DOI: 10.1140/epjc/s10052-022-10401-1