Natyashastra
पाता नवैकादश वा सम्पिष्टकमुदाहृतम् । वज्रवस्त्रं प्रयोक्तव्यमुपवर्तनमेव च ॥ २८६॥
Nine or eleven Pātas are mentioned as the Sampishṭaka; the Upavartana should be applied in the manner of the Vajratāla.
english translation
pAtA navaikAdaza vA sampiSTakamudAhRtam । vajravastraM prayoktavyamupavartanameva ca ॥ 286॥
hk transliteration by Sanscript