Brihat Parashara Hora Shastra
कोणेशत्वे यदैकस्य केन्द्रेशत्वं च जायते । केन्द्रे कोणे स्थितो वाऽसौ विशेषाद्योगकारकः ॥ १३॥
If one and the same Grah gets the lordships of a Kon, as well as a Kendr, or, if a Grah is in a Kendr, or in a Kon, it will prove specially a Yog Karak.
english translation
koNezatve yadaikasya kendrezatvaM ca jAyate । kendre koNe sthito vA'sau vizeSAdyogakArakaH ॥ 13॥
hk transliteration by Sanscript