@article{MZM_2001_70_6_a10,
     author = {S. P. Khekalo},
     title = {Iso-Huygens {Deformations} of {Homogeneous} {Differential} {Operators} {Related} to a {Special} {Cone} of {Rank~3}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {927--940},
     publisher = {mathdoc},
     volume = {70},
     number = {6},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_70_6_a10/}
}