Natyashastra
द्विकलो वापि मिश्रो वा प्रयोगोऽङ्गवशानुगः । अन्ते वास्याः प्रकर्तव्यः कदाचिदुपवर्तनम् ॥ २८८॥
Its application should consist of either two Kalās or mixed Kalās, according to the nature of its limbs; and sometimes, the Upavartana should be performed at its conclusion.
english translation
dvikalo vApi mizro vA prayogo'GgavazAnugaH । ante vAsyAH prakartavyaH kadAcidupavartanam ॥ 288॥
hk transliteration by Sanscript