Natyashastra
एभ्यस्त्वङ्गान्यथोद्धृत्य नानाच्छन्दःकृतानि तु । ध्रुवात्वं यानि गच्छन्ति तानि वक्ष्याम्यहं पुनः ॥ ३॥
From these types, when various forms (songs) are created in different metres, those which attain the character of Dhruvā—these I shall now describe.
english translation
ebhyastvaGgAnyathoddhRtya nAnAcchandaHkRtAni tu । dhruvAtvaM yAni gacchanti tAni vakSyAmyahaM punaH ॥ 3॥
hk transliteration by Sanscript