Bhaishajyaratnavali 4.121

Bhaiṣajyaratnāvalī (ed. Rājeśvaradatta Śāstrī) 4.121

svarasanirmāṇavidhiḥahatāttatkṣaṇākṛṣṭāhū dravyātkṣuṇṇātsamudbhavaḥ
vastraniṣpīḍito yaḥ syādū rasaḥ svarasa ucyate