Natyashastra
द्विकलं योगमाश्रित्य मध्यमासारितं तु तत् । चतुर्थीमादितः कृत्वा चतस्रः कण्डिका यथा ॥ ८३॥
By adopting a twofold combination, one obtains the medium Āsārita. When the fourth part is taken first, the four parts are arranged in proper order.
english translation
dvikalaM yogamAzritya madhyamAsAritaM tu tat । caturthImAditaH kRtvA catasraH kaNDikA yathA ॥ 83॥
hk transliteration by Sanscript