no. 3
On the moduli of curves with theta-characteristics
Compositio Mathematica, Tome 75 (1990) no. 3, pp. 287-297. 
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     author = {Nagaraj, D. S.},
     title = {On the moduli of curves with theta-characteristics},
     journal = {Compositio Mathematica},
     pages = {287--297},
     publisher = {Kluwer Academic Publishers},
     volume = {75},
     number = {3},
     year = {1990},
     mrnumber = {1070415},
     zbl = {0726.14019},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1990__75_3_287_0/}
}
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Nagaraj, D. S. On the moduli of curves with theta-characteristics. Compositio Mathematica, Tome 75 (1990) no. 3, pp. 287-297. http://archive.numdam.org/item/CM_1990__75_3_287_0/

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[Ha] Harris J., Theta-characteristics on algebraic curve, Trans. Am. Math. Soc. Vol. 271. (1982), 611-638. | MR | Zbl

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