The four sons of Śukrācārya (Shukracharya), the preceptor of Asuras, performed all their rituals, ceremonies and yajña (yajna). One of these four sons of Śukrācārya was Atri.

Mahābhārata (Kinjawadekar)(1.65.37)
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Mahābhārata Vols. 1-43 (Siddhāntabāgīśa)(1.60.37)