Geodesic
On~cuspidal divisors on the modular varieties of elliptic modules
Izvestiya. Mathematics , Tome 30 (1988) no. 3, pp. 533-547.

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Elliptic modules of arbitrary rank are considered over the polynomial ring $F_q[t]$. A compactification of the modular varieties that parametrizes such modules is constructed. A generalization of the Manin-Drinfel'd theorem on modular curves is proved: the difference of two adherent components of codimension 1 has finite order in the Picard group. Bibliography: 7 titles. 
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M. M. Kapranov. On~cuspidal divisors on the modular varieties of elliptic modules. Izvestiya. Mathematics , Tome 30 (1988) no. 3, pp. 533-547. http://geodesic.mathdoc.fr/item/IM2_1988_30_3_a4/

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