Brihat Parashara Hora Shastra
धूमो मण्डलतः शुद्धो व्यतीपातोऽत्र दोषदः। सषद्भोऽत्र व्यतीपातः परिवेषोऽतिदोषकृत्॥ ६२॥
Reduce Dhoom from 12 Rāśis to arrive at Vyatipat. Vyatipat is also inauspicious. Add six Rāśis to Vyatipat to know the position of Parivesh. He is extremely inauspicious.
english translation
dhUmo maNDalataH zuddho vyatIpAto'tra doSadaH। saSadbho'tra vyatIpAtaH pariveSo'tidoSakRt॥ 62॥
hk transliteration by Sanscript