I searched the acronym but it apparently stands for all sorts of phrases. Here's the context:

Imāmīs also claim that the Sunnīs omitted or suppressed Sūrat al-Nūrayn, “The Two Lights”; cf. Ar. text and trans. in Nöldeke, GQ, ii, 102-7) as well as other passages that testify to 'Alī’s distinct role as Muhammad’s spiritual and political heir.

closed as off-topic by Janus Bahs Jacquet, choster, Edwin Ashworth, Kristina Lopez, user98990 Jun 17 '15 at 16:17

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    I'm voting to close this question as off-topic because it is not about the English language, but an abbreviation used in a scholarly reference. A quick Google search reveals that it is an abbreviation (apparently quite common and standard, within the field) of Theodor Nöldeke’s Geschichte des Qorāns from 1919. – Janus Bahs Jacquet Jun 17 '15 at 16:06

The work is either too well-known to be given in full, or your excerpt has just missed the full reference:

Th. Nöldeke's Geschichte des Qorāns (1860)

  • now that's astute! – Fattie Jun 17 '15 at 19:14

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