Brihat Parashara Hora Shastra
भाग्येशो मूर्तिवर्ती चेत् सुतेशो नीचगो यदि । सुते केतुबुधौ स्यातां सुतं कष्टाद् विनिर्दिशेत् ॥ ७॥
Should Dharm‟s Lord be in Lagn, while Putr‟s Lord is in fall and Ketu is in Putr along with Budh, obtainment of progeny will be after a great deal of ordeal.
english translation
bhAgyezo mUrtivartI cet sutezo nIcago yadi । sute ketubudhau syAtAM sutaM kaSTAd vinirdizet ॥ 7॥
hk transliteration by Sanscript