Natyashastra
कनिष्ठिकाप्रवेशस्तु दशमी तु कला भवेत् । निष्क्रामश्चैव तर्जन्यास्तदनन्तरमिश्यते ॥ ४९॥
The tenth is the entry of the little finger and is regarded as a fractional beat (kalā); Thereafter, the movement out of the index finger is considered.
english translation
kaniSThikApravezastu dazamI tu kalA bhavet । niSkrAmazcaiva tarjanyAstadanantaramizyate ॥ 49॥
hk transliteration by Sanscript