The Buddha's struggle with the first absorption
Go to https://suttacentral.net/mn and follow the 2nd set of sutta references. 



M I 246 is within MN 36.

M III 162 is within MN 128.





The above said, Analayo's ideas about MN 128 are probably wrong. MN 128 is about a certain dilemma of Venerable Anuruddha, who later was renowned for his psychic powers. The certain dilemma or subject matter of MN 128 is 'obhāsañceva sañjānāma dassanañca rūpānaṃ', namely, 'perception of light and seeing of forms'. MN 128 appears to be about the coming to be of a psychic power rather than about the 1st jhana. Here, the Buddha gives an account of his own struggle with what appears to be a naturally occurrence of a physic power (which will not occur with every meditator, such as Venerable Sariputta, who did not have any psychic powers). Therefore, MN 128 does not appear to be about the Buddha's struggle with the first absorption.