Said by AG Mohan to be Yoga Makaranda Part 2 by Sri T Krishnamacharya

AG Mohan on Krishnamacharya’s approach to Śīrṣāsana.
Said by AG Mohan to be from Yoga Makaranda Part 2
Also downloadable as a PDF

Also a downloadable PDF based on the Yoga Makaranda on Āsana practice,
especially variations around Śīrṣāsana (described here as Viparīta Karaṇī Mudrā)

Interview with A.G. Mohan

An interview with AG Mohan from the site of Svastha Yoga Germany.
It is available online or as a downloadable PDF.