References

BhPr, 2, 3, 16.2
  saptadhā bhāvanāṃ dadyācchoṣayecca punaḥ punaḥ //Context
BhPr, 2, 3, 231.2
  bhāvayetsaptadhā pittairajāyāḥ sā viśudhyati //Context
BhPr, 2, 3, 244.2
  taptaṃ taptaṃ punarvajraṃ bhavedbhasma trisaptadhā //Context