@article{TMF_2009_161_2_a4,
     author = {D. P. Novikov},
     title = {The~$2{\times}2$ matrix {Schlesinger} system and {the~Belavin--Polyakov--Zamolodchikov} system},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {191--203},
     publisher = {mathdoc},
     volume = {161},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2009_161_2_a4/}
}