The paribhāṣā, yadāgamās tadguṇībhūtās tadgrahaṇena gṛhyante in the Pāṇinian tradition by Shen, Y

“…It argues that Pāṇini must have assumed the effect of the yadāgamaparibhāṣā, but he may not necessarily have assumed an additional paribhāṣā like yadāgamās tadguṇībhūtās tadgrahaṇena gṛhyante or tadbhaktas tadgrahaṇena gṛhayate to achieve this effect, because this effect can already be achieved through elements within the Aṣṭādhyāyī itself, i.e. sūtra 1.1.46 and 1.1.56. Therefore, such an additional paribhāṣā can be assumed, but is not necessary. …”