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Leon Karp; Norbert Peyerimhoff. (2000).
Spectral Gaps of Schrödinger Operators on Hyperbolic Space. , 217(1), 105–124.
doi:10.1002/1522-2616(200009)217:1<105::aid-mana105>3.0.co;2-e
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research
