@article{IVM_2005_10_a4,
     author = {Yu. Ya. Isaenko},
     title = {The structure of second-order periodic matrix functions having a determinant identically equal to one},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {47--53},
     publisher = {mathdoc},
     number = {10},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2005_10_a4/}
}