Phaladeepika
भावसमांशकसंस्था भावफलं पूर्णमेव कलयन्ति । न्यूनाधिकांशवशतः फलवृद्धिह्लसिता वाच्या ॥ ३५॥
Planets produce the full effects of the Bhavas respectively occupied by them when they are exactly posited in the (Bhavamsa = Semi-bhava in the middle or centre of the Bhava). If they should occupy a position less or greater than the semi-bhava, the effects are declared to be correspondingly increasing or decreasing as the case may be.
english translation
bhAvasamAMzakasaMsthA bhAvaphalaM pUrNameva kalayanti । nyUnAdhikAMzavazataH phalavRddhihlasitA vAcyA ॥ 35॥
hk transliteration by Sanscript