@article{VMUMM_2008_6_a5,
     author = {V. V. Palin},
     title = {Solvability of quadratic matrix equations},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {36--41},
     publisher = {mathdoc},
     number = {6},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2008_6_a5/}
}