no. 1-3
Relations between holomorphic quadratic differentials II
Compositio Mathematica, Tome 44 (1981) no. 1-3, pp. 67-77. 
@article{CM_1981__44_1-3_67_0,
     author = {Farkas, Hershel M.},
     title = {Relations between holomorphic quadratic differentials II},
     journal = {Compositio Mathematica},
     pages = {67--77},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {44},
     number = {1-3},
     year = {1981},
     zbl = {0488.30033},
     mrnumber = {662456},
     language = {en},
     url = {archive.numdam.org/item/CM_1981__44_1-3_67_0/}
}
Farkas, Hershel M. Relations between holomorphic quadratic differentials II. Compositio Mathematica, Tome 44 (1981) no. 1-3, pp. 67-77. http://archive.numdam.org/item/CM_1981__44_1-3_67_0/

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