@article{MZ_1989__202_1_174096,
     author = {Ja Kyung Koo},
     title = {Quotients of {Theta} {Series} as {Rational} {Functions} of {J} and ?.},
     journal = {Mathematische Zeitschrift},
     pages = {367--374},
     year = {1989},
     volume = {202},
     number = {1},
     zbl = {0659.10023},
     url = {http://geodesic.mathdoc.fr/item/MZ_1989__202_1_174096/}
}