@article{UZKU_2013_155_3_a2,
     author = {N. K. Petrova and Yu. A. Nefedev and S. A. Demin and A. V. Gusev},
     title = {Lunar studies at {Kazan} university: trends, results and {prospects.~I.} {Physical} libration},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {19--35},
     publisher = {mathdoc},
     volume = {155},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2013_155_3_a2/}
}