Brihat Parashara Hora Shastra
विभिन्नयोस्तु फलयोर्द्वयोः प्राप्तिर्भवेद्ध्रुवम् । ग्रहे पूर्णबले पुर्णमर्धमर्धबले फलम् ॥ १४७॥
If contrary results are thus indicated, the results will be nullified, while results of varied nature will come to pass. The Grah will yield full, half, or a quarter of the effects according to its strength being full, medium and negligible, respectively.
english translation
vibhinnayostu phalayordvayoH prAptirbhaveddhruvam । grahe pUrNabale purNamardhamardhabale phalam ॥ 147॥
hk transliteration by Sanscript