Pāṇini sūtras

An atmanepada affix is the substitute of the affix ñ (III.4.69) when it denotes the action of the verb or the object of the verb.

German Desgleichen beim Impersonale und Passiv. (13)

1. bhāva+karmaṇoḥभाव+कर्मणोः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   bब्	bhāvaभाव	bhāvaभाव	impersonal verb	bhāvभाव् + plus aअ
   kक्	karmanकर्मन्	karmaṇoḥकर्मणोः	passive voice	karmकर्म् + plus aṇo&अणो&

Anuvṛtti

1. ātmanepadamआत्मनेपदम् 1·3·12

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   āआ	ātmanepadaआत्मनेपद	ātmanepadamआत्मनेपदम्	medium voice	ātmanepadआत्मनेपद् + plus amअम्