Brihat Parashara Hora Shastra
एवं ग्रहबलं प्रोक्तमथ भावबलं शृणु । कन्यायुग्मतुलाकुम्भचापाद्यार्धाश्च सप्तमम् ॥ २६॥
Bhava Balas. Thus I explained about the strengths of the Grahas. Deduct Yuvati Bhava from the Bhava, if the Bhava happens to be in Kanya, Mithun, Tula, Kumbh, or the first half of Dhanu.
english translation
evaM grahabalaM proktamatha bhAvabalaM zaRNu । kanyAyugmatulAkumbhacApAdyArdhAzca saptamam ॥ 26॥
hk transliteration by Sanscript