Brihat Parashara Hora Shastra
एकग्रहा कनिष्ठा सा द्विग्रहा मध्यमा स्मृता । अर्गला द्व्यधिकोत्पन्ना मुनिभिः कथितोत्तमा ॥ ७॥
Maharishis say, that the Argala, caused by one Grah, will yield limited effect, by two medium and by more than two, excellent effects.
english translation
ekagrahA kaniSThA sA dvigrahA madhyamA smRtA । argalA dvyadhikotpannA munibhiH kathitottamA ॥ 7॥
hk transliteration by Sanscript