By scientific studies, do you mean, FFA type stuff, with math-ings and frequency graphs and whatnot, or do you mean Overviews of Hindustani theory?
If you mean theory and practice, there's an excellent text from 1898, by Bhavánráv A. Pingle, entitled "Indian Music," which goes over waaaaaay more than I could absorb.
Best of all, you can get it free as a pdf from google books. Or at least you could a few years ago, I'm assuming you still can....
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