Natyashastra
प्रायेण माषघातश्च विवधाङ्गः प्रकीर्तितः । सन्निपातश्च पश्चार्धः कदाचिदुपवर्तनम् ॥ २७९॥
Generally, the Māṣaghāta is said to be a limb of the Vivadha, and at its end there should be a Sannipāta, and sometimes an Upavartana.
english translation
prAyeNa mASaghAtazca vivadhAGgaH prakIrtitaH । sannipAtazca pazcArdhaH kadAcidupavartanam ॥ 279॥
hk transliteration by Sanscript