Brihat Parashara Hora Shastra
मेषे धनुषि वा केतौ कारकांशात् व्यये स्थिते । शुभखेटेन सन्दृष्टे सायुजपदमाप्नुयात् ॥ ६६॥
If Ketu is in the 12th from Karakāńś, receiving a Drishti from a malefic.
english translation
meSe dhanuSi vA ketau kArakAMzAt vyaye sthite । zubhakheTena sandRSTe sAyujapadamApnuyAt ॥ 66॥
hk transliteration by Sanscript