Geodesic
On the Isomorphisms Between Certain Congruence Groups, II
Canadian journal of mathematics, Tome 25 (1973) no. 5, pp. 1006-1014

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For integral domains of characteristic not 2, we prove here that the symplectic and unitary congruence groups are not isomorphic if the Witt indices are at least 3. This is Theorem 2.1; Theorem 3.3 describes the isomorphisms of unitary congruence groups. 
Solazzi, Robert. On the Isomorphisms Between Certain Congruence Groups, II. Canadian journal of mathematics, Tome 25 (1973) no. 5, pp. 1006-1014. doi: 10.4153/CJM-1973-108-8
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