References

RArṇ, 12, 21.1
  grāhyaṃ tatphalatailaṃ vā yantre pātālasaṃjñake /Context
RKDh, 1, 1, 42.1
  etad budhaiḥ samākhyātaṃ yantraṃ pātālasaṃjñakam /Context
RKDh, 1, 1, 64.3
  garte nidhāyoparyagnir yantraṃ pātālasaṃjñakam //Context