R
[Ram98] Jorge Luis Ramírez Alfonsín. On Variations of the Subset Sum Problem. Discrete Applied Mathematics 81(1-3):1-7. Elsevier, janvier 1998. 
@article{dam81(1-3)-Ram,
  author =              {Ram{\'\i}rez{ }Alfons{\'\i}n, Jorge Luis},
  title =               {On Variations of the Subset Sum Problem},
  publisher =           {Elsevier},
  journal =             {Discrete Applied Mathematics},
  volume =              {81},
  number =              {1-3},
  pages =               {1-7},
  year =                {1998},
  month =               jan,
}
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