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UEYAMA Daijun (1965) 敦煌出土のチベッ ト訳般若心經 [=Tibetan Version of the Prajñapāramitāhṛdayasūtra from Dūnhuáng]. Indogaku bukkyōgaku kenkyū 13(2): 783-779 [sic]. [Article is in Japanese].

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རྒྱ་གར་སྐད་དུ། བྷ་ག་བ་ཏཱི་པྲཛྙཱ་པཱ་ར་མི་ཏཱ་ཧྲྀ་ད་ཡ། (rgya gar skad du | bha ga ba ti pradznyā pā ra mi tā hri da ya) = Ārya Bhagavatī Prajñāpāramitā-hṛdaya. Long Text Heart Sutra in the Tibetan Kangyur, Derge Edition, Vol. 34: 144b.6-146a.3. Tibetan & Himalayan Library.