@article{VMJ_2004_6_3_a2,
     author = {M. A. Berdikulov},
     title = {A new order structure of real symmetric $(2\times 2)$-matrices},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {12--20},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2004_6_3_a2/}
}