@article{TMF_2001_129_2_a14,
     author = {L. O. Chekhov},
     title = {Observables in $2+1$ {Gravity} and {Noncommutative} {Teichm\"uller} {Spaces}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {360--368},
     publisher = {mathdoc},
     volume = {129},
     number = {2},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_129_2_a14/}
}