Geodesic
The index of a~net subgroup of a~symplectic group over a~Dedekind ring
Zapiski Nauchnykh Seminarov POMI, Rings and linear groups, Tome 75 (1978), pp. 74-86

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An explicit formula is derived for the index of a net congruence subgroup of a symplectic group over a Dedekind ring. A classification of symplectic $D$-nets over a field is obtained along the way. Bibl. 7 titles. 
@article{ZNSL_1978_75_a8,
     author = {E. V. Dybkova},
     title = {The index of a~net subgroup of a~symplectic group over {a~Dedekind} ring},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {74--86},
     publisher = {mathdoc},
     volume = {75},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_75_a8/}
}
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E. V. Dybkova. The index of a~net subgroup of a~symplectic group over a~Dedekind ring. Zapiski Nauchnykh Seminarov POMI, Rings and linear groups, Tome 75 (1978), pp. 74-86. http://geodesic.mathdoc.fr/item/ZNSL_1978_75_a8/