Phi-calculus : A new fuzzy arithmetic. - Hakim Lamara; Laurent Vermeiren; Dominique Roger (ETFA, 2006)

Aggregation and fuzzification by Weighted Fuzzy Fusion Operator. - Hakim Lamara; Laurent Vermeiren; Dominique Roger (FUZZ-IEEE, 2007)

Phi-Calculus Fuzzy Arithmetic: application to model based control. - Laurent Vermeiren; Thierry-Marie Guerra; Hakim Lamara (IFSA/EUSFLAT Conf., 2009)

Application of practical fuzzy arithmetic to fuzzy internal model control. - Laurent Vermeiren; Thierry-Marie Guerra; Hakim Lamara (Eng. Appl. Artif. Intell., 2011)