References

RRÅ, V.kh., 1, 9.1
  siddhaiḥ śivamukhāt prāptaṃ teṣāṃ siddhistu sādhanāt /Context
RRÅ, V.kh., 19, 123.2
  devānāṃ divyadhūpo'yaṃ mantrāṇāṃ sādhane hitaḥ //Context