Nāgārjuna
All things are empty of inherent existence.
Fundamental Verses on the Middle Way (Mūlamadhyamakakārikā), 27 chapters essential
About 450 verses. The attribution to Nagarjuna is not disputed, but the author's life is legendary and the text comes to us through commentaries (Akutobhayā, Buddhapālita, Bhāviveka, Candrakīrti) and a Chinese translation of 409: the Sanskrit is partly reconstructed, and editions differ a little (especially in chapters 17, 18, 25 and 27). These are his own verses, not words reported by others: we therefore use the badge "written by the author", as for other ancient texts, while noting that we know nothing of how he circulated it.
Averting the Arguments (Vigrahavyāvartanī), 70 verses and their commentary
Verses 1 to 20 give the objections of a realist opponent; verses 21 to 70 are Nagarjuna's reply. Attribution debated, though most scholars accept it (Lindtner counts it among his authentic works); a few place it outside the secure core, and the doubt bears mainly on the prose commentary, which may be by a later hand. The Sanskrit survives in one manuscript, completed by the Tibetan. Bhattacharya's English is digitised incompletely (commentary cut).
Other attributed texts (Yuktiṣaṣṭikā, Śūnyatāsaptati, Ratnāvalī, Suhṛllekha…)
The list of authentic works is debated. None is in our corpus.
Prasannapadā, Candrakīrti's commentary
A commentary on the Verses by Candrakīrti (7th c.). This is not Nagarjuna: we quote it only as an early reading.