@misc{miguel2016definition,
  title = {Definition of Productivity},
  author = {Estelles Miguel, Sofia and Andrés Romano, Carlos and Palmer Gato, Marta Elena and Albarracín Guillem, José Miguel},
  eventtitle = {International Joint Conference - CIO-ICIEOM-IISE-AIM (IJC2016), “XX Congreso de Ingeniería de Organización”, “XXII International Conference on Industrial Engineering and Operations Management”, “International IISE Conference 2016”, and “International (San Sebastián, Spain. . 2016)},
  year = {2016}
}