Brihat Parashara Hora Shastra
त्रिदशे च त्रिकोणे च चतुरस्रे च सप्तमे । पादवृद्धया प्रपश्यन्ति प्रयच्छन्ति फलं तथा ॥ ३॥
3rd and 10th, 5th and 9th, 4th and 8th and lastly 7th. On these places the Drishtis increase gradually in slabs of quarters, i.e ¼, ½, ¾ and full.
english translation
tridaze ca trikoNe ca caturasre ca saptame । pAdavRddhayA prapazyanti prayacchanti phalaM tathA ॥ 3॥
hk transliteration by Sanscript