The Structure and Formation of the Aṅguttara Nikāya and the Ekottarika Āgama
By Tse-fu Kuan and Roderick S. Bucknell
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.