1. Borg, I., & Groenen, P. (2005). Modern multidimensional scaling. Theory and applications (2nd ed.). Berlin: Springer.
2. Bove, G., & Okada, A. (2018). Methods for the analysis of asymmetric pairwise relationships. Advanced Data Analysis and Classification, 12(1), 5–31.
3. Brossier, G. (1982). Classification hiérarchique a partir de matrices carrées non symétriques. Statistiques et Analyse des Données, 7, 22–40.
4. Constantine, A. G., & Gower, J. C. (1978). Graphic representations of asymmetric matrices. Applied Statistics, 27, 297–304.
5. Constantine, A. G., & Gower, J. C. (1982). Models for the analysis of interregional migration. Environment and Planning A, 14, 477–497.