References – SN 35.88: Puṇṇa 
Readings by Ajahn Pasanno:
Sutta: SN 35.70, Saḷāyatanasaṁyutta, “Upavāṇa.”
Sutta: SN 35.74, Saḷāyatanasaṁyutta, “Sick (1).”
Sutta: SN 35.88, Saḷāyatanasaṁyutta, “Puṇṇa.”
Sutta: SN 35.93, Saḷāyatanasaṁyutta, “The Dyad (2).”
The Fourth Foundation of Mindfulness [2013], Session 40
Comment: Comparison of Ajahn Lee going to Bangkok with Venerable Puṇṇa going to Sunāparanta (SN 35.88). [Ajahn Lee Dhammadharo] [History/Thai Buddhism] [Great disciples] [Teaching Dhamma]
Comment: Ajahn Lee discovered breath meditation method 2 while coping with a heart attack in the wilderness. [Mindfulness of breathing] [Sickness]
The Fourth Foundation of Mindfulness [2013], Session 40, Excerpt 3