Natyashastra
उत्तरं द्वादशपरं षडङ्गावरमिष्यते । आकारपादहीनेन तुल्यं रोविन्दकेन तु ॥ २१२॥
The Uttara is said to have a maximum of twelve limbs and a minimum of six limbs. When the Ākāra and Pāda are absent, it is considered equivalent to the Rovindaka.
english translation
uttaraM dvAdazaparaM SaDaGgAvaramiSyate । AkArapAdahInena tulyaM rovindakena tu ॥ 212॥
hk transliteration by Sanscript