On computing bounds for the least singular value of a triangular matrix. Anderson, N. & Karasalo, I. BIT, 15:1–4, 1975.
doi  bibtex   
@Article{NAIK1975,
  author       = {Ned Anderson and Ilkka Karasalo},
  title        = {On computing bounds for the least singular value of a triangular matrix},
  volume       = {15},
  pages        = {1--4},
  year         = {1975},
  doi          = {10.1007/BF01932992},
  file         = {:papers/AndersonKarasalo1975.pdf:PDF},
  journal = {BIT},
}

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