@article{CM_1993__85_1_1_0,
     author = {Ichikawa, Takashi},
     title = {The universal periods of curves and the {Schottky} problem},
     journal = {Compositio Mathematica},
     pages = {1--8},
     publisher = {Kluwer Academic Publishers},
     volume = {85},
     number = {1},
     year = {1993},
     mrnumber = {1199201},
     zbl = {0783.14018},
     language = {en},
     url = {http://www.numdam.org/item/CM_1993__85_1_1_0/}
}