@article{VMUMM_2013_4_a10,
     author = {L. N. Sysoeva},
     title = {Certain properties of generalized $\alpha$-formulas},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {51--55},
     publisher = {mathdoc},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2013_4_a10/}
}