References

ÅK, 1, 25, 20.2
  tadvadviśuddhanāgaṃ hi dvitayaṃ taccatuṣpalam //Context
ÅK, 2, 1, 100.1
  punaḥ punaśca piṣṭvātha puṭaiḥ ṣaḍbhirviśudhyati /Context
ÅK, 2, 1, 326.1
  evaṃ viśuddhaṃ saṃgrāhyaṃ tattadyogeṣu yojayet /Context