@revista_internacional{215, author = {Francisco Herrera and Enrique Herrera-Viedma and Luis Martínez and PP Wang}, title = {Recent advancements of fuzzy sets: Theory and practice}, year = {2006}, journal = {INFORMATION SCIENCES}, volume = {176}, number = {4, SI}, pages = {349-351}, month = {FEB}, issn = {0020-0255}, doi = {10.1016/j.ins.2005.07.003}, }