Brihat Parashara Hora Shastra
ग्रहाणामुक्तयोगेषु क्रूरसौम्यविभागतः । बलाबलविवेकेन फलमूह्यं विचक्षणैः ॥ १७॥
The Yogas, mentioned above (up to Sloka 16) should be delineated after knowing favourable, or unfavourable dispositions of the participant Grahas and their strength and weakness.
english translation
grahANAmuktayogeSu krUrasaumyavibhAgataH । balAbalavivekena phalamUhyaM vicakSaNaiH ॥ 17॥
hk transliteration by Sanscript