Brihat Parashara Hora Shastra
रन्ध्रस्थानगतानां च दशाऽनिष्टफलप्रदा । एवं भावेशसम्बन्धादूरनीयं दशाफलम् ॥ २०॥
Thus the Dashas should be considered favourable, after taking into account the placement of a Grah and his relationship of one Grah with the other. (Rahu and Ketu give favourable results in Sahaj, Ari and Labh).
english translation
randhrasthAnagatAnAM ca dazA'niSTaphalapradA । evaM bhAvezasambandhAdUranIyaM dazAphalam ॥ 20॥
hk transliteration by Sanscript