The Structure and Formation of the Aṅguttara Nikāya and the Ekottarika Āgama
By Tse-fu Kuan and Roderick S. Bucknell
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some groups of suttas in the Aṅguttara Nikāya with saṃyutta-like nature were probably moved from the Saṃyutta Nikāya to the Aṅguttara Nikāya within the Pali tradition. Evidence of a comparable movement into the Ekottarika Āgama is also available.