Geodesic
Covariant quantization of the relativistic string with a nontrivial topology of the world sheet
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 9, Tome 180 (1990), pp. 142-160

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The wave functions of the relativistic string with a nontrivial topology of the world sheet are considered as the common cocycles of Lie algebra quasiconformal transformations. The equations for physical string states are presented, their solutions are constructed with proper normalization. 
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     author = {G. A. Pelts},
     title = {Covariant quantization of the relativistic string with a nontrivial topology of the world sheet},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {142--160},
     publisher = {mathdoc},
     volume = {180},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_180_a13/}
}
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G. A. Pelts. Covariant quantization of the relativistic string with a nontrivial topology of the world sheet. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 9, Tome 180 (1990), pp. 142-160. http://geodesic.mathdoc.fr/item/ZNSL_1990_180_a13/