@article{ZNSL_2016_453_a2,
     author = {A. E. Guterman and D. K. Kudryavtsev},
     title = {The lengths of the quaternion and octotion algebras},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {22--32},
     year = {2016},
     volume = {453},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2016_453_a2/}
}