An empty exercise. de Boor, C. ACM SIGNUM Newsletter, 25(4):2–6, 1990.
bibtex   
@Article{         de-Boor_1990aa,
  author        = {de Boor, Carl},
  file          = {Boor_1990aa.pdf},
  journal       = {ACM SIGNUM Newsletter},
  number        = {4},
  pages         = {2--6},
  title         = {An empty exercise},
  volume        = {25},
  year          = {1990}
}

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