Natyashastra
गुरुर्गाथांशको यत्स्यात्सर्वपादेषु दृश्यते । श्रीरिति ख्यातनामा सा कीर्तिता प्रथमा ध्रुवा ॥ ४६॥
That metre in which a gāthā-portion consisting of long syllables (guru) is found in all the padas, is known by the name Śrī, and is declared to be the first Dhruvā.
english translation
gururgAthAMzako yatsyAtsarvapAdeSu dRzyate । zrIriti khyAtanAmA sA kIrtitA prathamA dhruvA ॥ 46॥
hk transliteration by Sanscript