Kullback–Leibler entropy and Penrose conjecture in the Lemaître–Tolman–Bondi modelNan Li, Xiao-Long Li and Shu-Peng SongEur. Phys. J. C, 75 3 (2015) 114DOI: https://doi.org/10.1140/epjc/s10052-015-3334-8