References
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J. K. Koo, Quotients of theta series as rational functions of J and
$\lambda$ , Math. Z. 202 (1989), no. 3, 367-373. https://doi.org/10.1007/BF01159965
DOI QR Code
For two even unimodular positive definite integral quadratic forms A[X], B[X] in n-variables, J. K. Koo [1, Theorem 1] showed that