Distances between fuzzy sets representing grey level images. - Robert Lowen; Werner Peeters (Fuzzy Sets Syst., 1998)

Subspaces of smooth fuzzy topologies and initial smooth fuzzy structures. - Werner Peeters (Fuzzy Sets Syst., 1999)

Anisotropic semi-pseudometrics. - Robert Lowen; Werner Peeters (J. Intell. Fuzzy Syst., 2000)

The complete lattice of smooth fuzzy topologies. - Werner Peeters (Fuzzy Sets Syst., 2002)