Phaladeepika
कलत्रसंस्थस्य कलत्रदृष्टे दर्शागमेवाथ कलत्रपस्य । यदा विलग्नाधिपतिः प्रयाति कलत्रभं तत्र कलत्रलाभः ॥ १३॥
The acquisition of a wife (may happen during the Dasa period of the planet (1) posited in the 7 th house, (2) aspecting the 7 th house or (3) owning the 7 th house. The same may also happen, when the lord of the Lagna in his orbit comes to the Rasi representing the 7 th house.
english translation
kalatrasaMsthasya kalatradRSTe darzAgamevAtha kalatrapasya । yadA vilagnAdhipatiH prayAti kalatrabhaM tatra kalatralAbhaH ॥ 13॥
hk transliteration by Sanscript