Bounds for Row-aggregation in Linear Programming. Zipkin & H, P. Operations Research, 28(4):903--916, 1980.
bibtex   
@article{ zipkin1980bounds,
  title = {Bounds for Row-aggregation in Linear Programming},
  author = {Zipkin, Paul H},
  journal = {Operations Research},
  volume = {28},
  number = {4},
  pages = {903--916},
  year = {1980},
  keywords = {linear programming, variable aggregation}
}

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