References

KaiNigh, 2, 22.1
  ayaḥ kālāyasaṃ tīkṣṇaṃ piṇḍaṃ pāravasaṃ ghanam /Context
MPālNigh, 4, 14.1
  lohaṃ śastram ayaḥ kuṣṭhaṃ vyaṅgaṃ pārāvataṃ ghanam /Context