How do you define and measure research productivity?

Giovanni Abramo, Ciriaco Andrea D'Angelo. How do you define and measure research productivity?. Scientometrics, 101(2):1129-1144, 2014. [doi]

@article{AbramoD14-0,
  title = {How do you define and measure research productivity?},
  author = {Giovanni Abramo and Ciriaco Andrea D'Angelo},
  year = {2014},
  doi = {10.1007/s11192-014-1269-8},
  url = {http://dx.doi.org/10.1007/s11192-014-1269-8},
  researchr = {https://researchr.org/publication/AbramoD14-0},
  cites = {0},
  citedby = {0},
  journal = {Scientometrics},
  volume = {101},
  number = {2},
  pages = {1129-1144},
}