@article{TMF_1996_109_2_a3,
     author = {I. N. Nikitin},
     title = {Special types of string motions with anomaly-free quantization},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {202--214},
     year = {1996},
     volume = {109},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1996_109_2_a3/}
}