Brihat Parashara Hora Shastra
वर्गविश्वाः स्वविश्वघ्नाः पुनर्विंशतिभाजिताः। विश्वाफलोपयोग्यं तत्पञ्चोनं फलदो न हि॥ २६॥
Vimshopak Proportional Evaluation. Multiply the figure due to full strength for the division by the Varg Vishwa and divide by 20 to get the exact strength of the Grah. If the total is below 5, the Grah will not be capable of giving auspicious results
english translation
vargavizvAH svavizvaghnAH punarviMzatibhAjitAH। vizvAphalopayogyaM tatpaJconaM phalado na hi॥ 26॥
hk transliteration by Sanscript