@article{VMUMM_2008_5_a5,
     author = {Qi Chengzhi and Wang Mingyang and Qian Qihu and Chen Jianjie},
     title = {Structural hierarchy of rock masses and the mechanisms of its formation},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {31--39},
     publisher = {mathdoc},
     number = {5},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2008_5_a5/}
}