@article{VUU_2013_2_a7,
     author = {B. P. Kondratyev and N. G. Trubitsyna and A. O. Oparin and P. O. Solovyeva},
     title = {A non-homogeneous sphere as a model of the planets. {Internal} points of maximum gravity},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {74--84},
     publisher = {mathdoc},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2013_2_a7/}
}