Brihat Parashara Hora Shastra
लग्नेशात् केन्द्रकोणस्थे राहौ लग्नं विना स्थिते । अष्टोत्तरी दशा विप्र विज्ञेया रौद्रभादितः ॥ १७॥
Maharishi Parashar said. O Brahmin, the sages have recommended the adoption of Ashtottari, when Rahu not being in Lagn, in any other Kendr, or Trikon to the Lord of the Lagn.
english translation
lagnezAt kendrakoNasthe rAhau lagnaM vinA sthite । aSTottarI dazA vipra vijJeyA raudrabhAditaH ॥ 17॥
hk transliteration by Sanscript