[Much of the matter here is from Mayeda 1967-68.]
GKBh: Sankara's Gaudapadiyabhasya.
MUBh: Sankara's Mandukyopanisadbhasya.
MU consists of only 12 prose sentences. [Mayeda 1967-68 73.]
In MS as well as printed editions, the MU is interspersed among the 29 stanzas of the first prakarana of the GK, which comprises 4 prakaranas explaining the MU. [Mayeda 1967-68 73.]
GK is also called Agamasastra, or Mandukyakarika. [Mayeda 1967-68 73-74.]
GKBh is also called Agamasastra-vivarana, Gaudapadiya-gamasastra-bhasya, and Gaudapadiya-gamasastra-vivarana. [Mayeda 1967-68 74n2.]
GKBh: oldest extant work before Sankara (AD 700-750), and stands in the line of Advaita philosophy. [Mayeda 1967-68 74.]
Tradition: that Sankara, commenting on both texts (MU and GK) wrote both the MUBh and GKBh. [Mayeda 1967-68 74.]
It is generally taken for granted that the GKBh and the MUBh are commented by a single hand. Mayeda finds no evidence for questioning this. [Mayeda 1967-68 75n1.]
- Bhattacharya, V. "Mandukya Upanisad and the Gaudapada Karika." Indian Historical Quarterly 1 (1925) 119-125, 295-302. [For latter pagination, see http://faculty.washington.edu/kpotter/xtxt2.htm as of 5 Apr 2011.]
- Bhattacharya, V. The Agamasastra of Gaudapada. Calcutta: University of Calcutta, 1952. 46-52. Questions authenticity of MUBh and GKBh (xxxiii n3).
- Karmarkar, R.D. Gaudapada-Karika. Poona: Government Oriental Series, Class B, No. 9, 1953) xxxi-xxxiii.
- Nakamura, H. Vedanta Tetsugaku no Hatten (= The Development of the Vedanta Philosophy) (Tokyo: Iwanami Shoten, 1955) 557-565. 527-534: Questions authenticity of MUBh and GKBh.
- Jacobi, H. "On Mayavada." Journal of the American Oriental Society 33 (1913) 51-54. [For pagination, see http://faculty.washington.edu/kpotter/xtxt2.htm as of 5 Apr 2011.] 52, n. 2: suspicion of the identity of the commentator of the GK with the author of the BSBh. [Mayeda 1967-68 74.]
- Chintamani, T.R. "Sankara - The Commentator on the Mandukya Karikas." Proceedings of the Third Oriental Conference (Madras, 1924) 419-21: objects to Jacobi. [Mayeda 1967-68 74n3.] [Till Mayeda,] Chintamani was the only scholar so far to defend the tradition [of Sankara authorship of the MUBh and GKBh], but he could not show any strong positive evidence. [Mayeda 1967-68 74n4.]
- Bhattacharya, V. "Sankara's Commentaries on the Upanisads." Sir Asutosh Mookerjee Silver Jubilee Volume, vol. 3, pt. 2 (Calcutta, 1925) 103-10: Questions the authenticity of the MUBh and the GKBh. [Mayeda 1967-68 74n4.] 104: From the fact that Sankara nowhere quotes the MU, even where it could have served his purpose, e.g. in commenting on the Chand. Up. 2, 23, 3, Bhattacharya infers that the MU itself was not written before or even in the time of Sankara. This theory is rejected by Nakamura, see Vedanta Tetsugaku... 536-539. [Mayeda 1967-68 81n2.]
- Bhattacharya, V. "The Gaudapada-Karika on the Mandukya Upanisad." Proceedings of the Second Oriental Conference (1922) 439-462. [for pagination, see http://faculty.washington.edu/kpotter/xtxt2.htm as of 5 apr 2011] 441n1, 442, 444n4, 454n1: questions authenticity of MUBh and GKBh. [Mayeda 1967-68 74n4.]
- Belvalkar, S.K. Shree Gopal Basu Mallik Lectures on Vedanta Philosophy, pt. 1 (Poona, 1929) 218: Questions authenticity of MUBh and GKBh.
- Devaraja, N.K. An Introduction to Sankara's Theory of Knowledge (Varanasi, 1962) 38-42. Questions authenticity of MUBh and GKBh.
- Venkatasubbiah, A. "The Mandukyopanisad and Gaudapada," Indian Antiquary 62 (1933) pt. DCCLXXII, 185-186: Sankara does not quote the MK at all nor even refer to it in the BSBh nd other works. [Mayeda 1967-68 81.]
- Nikhilanananda. The Mandukyopanisad with Gaudapada's Karika and Sankara's Commentary. (Mysore: Sri Ramakrishna Asrama, 1955) 217-219 and 219n1. [Mayeda 1967-68 84n3.]
- Mayeda, Sengaku. "On the Author of the Mandukyopanisad and the Gaudapadiya-Bhasya." The Adyar Library Bulletin 31-32 (1967-68) 73-94. 94: concludes that the GKBh including the MUBh is one of Sankara's genuine works.
- Vetter, T. "Die Gaudapadiya-Karikas: Zur Entstehung und zur Bedeutung von (a)dvaita." Wiener Zeitschrift fur die Kunde Sudasiens 22 (1978) 95-131. [Halbfass 1991/1992 186n41.]
- Vetter, T. Studien zur Lehre und Entwicklung Sankaras. Vienna, 1979. [Halbfass 1991/1992 139.] Like Hacker, he sees the MUBh and GKBh as the earliest document of Sankara's transition [from Yoga] to Advaita Vedanta (Halbfass 1991/1992 139).
- Vetter, T. "Erfahrung des Unerfahrbren bei Sankara." Transcendenzerfahrung, Vollzughorizont des Heils. Ed. G. Oberhammer. Vienna, 1978. 45-59. [Halbfass 1991/1992 139, 186n40.]