@article{similaritycardinalityandentropyfor,
  title = {Similarity, Cardinality and Entropy for Bipolar Fuzzy Set in the Framework of Penta-valued Representation},
  author = {Vasile Patrascu},
  year = {2015},
  eprint = {1506.02060},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1506.02060v1},
}