Fuzzy projective geometries. - Leen Kuijken (EUSFLAT-ESTYLF Joint Conf., 1999)

Fibered geometries. - Leen Kuijken; Hendrik Van Maldeghem (Discret. Math., 2002)

On the definition and some conjectures of fuzzy projective planes by Gupta and Ray, and a new definition of fuzzy building geometries. - Leen Kuijken; Hendrik Van Maldeghem (Fuzzy Sets Syst., 2003)