References

RRÅ, R.kh., 2, 8.2
  pratyekaṃ pratyahaṃ yatnātsaptarātraṃ vimardayet //Context
RRÅ, V.kh., 20, 137.2
  guṭikāṃ kāmadhenuṃ tāṃ pratyahaṃ dhārayenmukhe /Context