Natyashastra
त्र्यवरैकादशपरा विदार्यः परिकीर्तिताः । चतुर्विंशतिरेतासां प्रणामं परमं स्मृतम् ॥ १८६॥
Vidārīs in a song are said to be three in the minimum and eleven in the maximum, ॥ but॥ their highest number may ॥ in rare cases॥ be twenty-four.
english translation
tryavaraikAdazaparA vidAryaH parikIrtitAH । caturviMzatiretAsAM praNAmaM paramaM smRtam ॥ 186॥
hk transliteration by Sanscript