@article{DANMA_2020_493_a6,
     author = {V. P. Platonov and V. S. Zhgoon and M. M. Petrunin},
     title = {On the problem of periodicity of continued fraction expansions of $\sqrt{f}$ for cubic polynomials over number fields},
     journal = {Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleni\^a},
     pages = {32--37},
     year = {2020},
     volume = {493},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DANMA_2020_493_a6/}
}