Linguistic Z-Number Bonferroni Mean and Linguistic Z-Number Geometric Bonferroni Mean Operators: Their Applications in Portfolio Selection Problems. - Amir Hosein Mahmoodi; Seyed Jafar Sadjadi; Soheil Sadi-Nezhad; Roya Soltani; Farzad Movahedi Sobhani (IEEE Access, 2020)