References

RRÅ, R.kh., 8, 77.2
  tanmadhye bhāvitaṃ nāgaṃ śuddhaṃ sekaṃ tu saptadhā //Context
RRÅ, V.kh., 8, 11.1
  patrādilepasekaṃ ca saptavārāṇi secayet /Context