References

RRÅ, V.kh., 4, 155.2
  tacchulbaṃ triguṇaṃ tāre nirvāpyaṃ kāñcanaṃ bhavet //Context
RRÅ, V.kh., 6, 97.1
  anena kramayogena vaṅgaṃ nirvāpya ṣaḍguṇam /Context