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ThereIn response to your first question (a book that studies the set of HQ), there is a book from Hurwitz, in German, Vorlesungen über die Zahlentheorie der Quaternionen, Verlag von Julius Springer, 1919, available here
There is a book from Hurwitz, in German, Vorlesungen über die Zahlentheorie der Quaternionen, Verlag von Julius Springer, 1919, available here
In response to your first question (a book that studies the set of HQ), there is a book from Hurwitz, in German, Vorlesungen über die Zahlentheorie der Quaternionen, Verlag von Julius Springer, 1919, available here
