Geodesic
An integrality criterion for elliptic modular forms
Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 1 (1990) no. 1, pp. 3-9.

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Let \( f \) be an elliptic modular form level of N. We present a criterion for the integrality of \( f \) at primes not dividing N. The result is in terms of the values at CM points of the forms obtained applying to \( f \) the iterates of the Maaß differential operators.
Si enuncia un criterio di integralità per i primi non dividenti il livello per forme modulari ellittiche. Il criterio si basa sui valori assunti in certi punti particolari del semipiano a parte immaginaria positiva dalle forme ottenute applicando gli iterati degli operatori di Maaß alla forma in esame. 
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Mori, Andrea. An integrality criterion for elliptic modular forms. Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 1 (1990) no. 1, pp. 3-9. http://geodesic.mathdoc.fr/item/RLIN_1990_9_1_1_a1/

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