Natyashastra
रोविन्दकं तु सप्ताङ्गे षोडशाङ्गं परं स्मृतम् । द्वौ पादौ समवर्णौ तु एकको वात्र कीर्तितौ ॥ १९२॥
The Rovindaka consists of seven limbs [in the minimum] and sixteen limbs in the maximum, and Ekakas in them should consist of two [consecutive] pādas consisting of equal Varṇas.
english translation
rovindakaM tu saptAGge SoDazAGgaM paraM smRtam । dvau pAdau samavarNau tu ekako vAtra kIrtitau ॥ 192॥
hk transliteration by Sanscript