Brihat Parashara Hora Shastra
अथ तारग्रहाणां तु युद्ध्यतोश्च द्वयोर्मिथः । बलान्तरं विजेतुः स्वं निर्जितस्य बले त्वृणम् ॥ २०॥
War Between Grahas. Should there be a war between the starry Grahas, the difference between the Shad Balas of the two should be added to the victor‟s Shad Bal and deducted from the Shad Bal of the vanquished.
english translation
atha tAragrahANAM tu yuddhyatozca dvayormithaH । balAntaraM vijetuH svaM nirjitasya bale tvRNam ॥ 20॥
hk transliteration by Sanscript