Brihat Parashara Hora Shastra
एकश्चरे स्थिरेऽन्यश्चेत् तदामध्यमुदाहृतम् । द्वौ वा द्वन्द्वे स्थितौ विप्र मध्यमायुस्तथापि च ॥ ३७॥
One in a Movable Rāśi and the other in a Fixed Rāśi will give medium life. If both are in Dual Rāśis, then again medium life will be obtained.
english translation
ekazcare sthire'nyazcet tadAmadhyamudAhRtam । dvau vA dvandve sthitau vipra madhyamAyustathApi ca ॥ 37॥
hk transliteration by Sanscript