References

KaiNigh, 2, 7.1
  śuddhaṃ kupyaṃ vasuśreṣṭhaṃ vimalaṃ śvetakaṃ śivam /Context
RājNigh, 13, 15.2
  kupyaṃ dhautaṃ tathā saudhaṃ candrahāsaṃ munīndukam //Context
RKDh, 1, 1, 171.2
  mṛdbhāgatrayasaṃyuktaṃ kiṃcit kupyaṃ pradīyate //Context