Natyashastra
सन्निपातद्वयोपेता द्विचित्रस्तु प्रयोक्तृभिः । कार्यश्चतुष्कलो युग्मः सुमुख्याश्च यथाक्रमम् ॥ १३९॥
The double Sannipāta is to be applied with two Citra beats by the performers. The four-Kalā Yugma is to be performed for Sumukhī, in proper sequence.
english translation
sannipAtadvayopetA dvicitrastu prayoktRbhiH । kAryazcatuSkalo yugmaH sumukhyAzca yathAkramam ॥ 139॥
hk transliteration by Sanscript