Drezner et al. (2002)Drezner, Zvi; Klamroth, Kathrin; Schöbel, Anita; Wesolowsky, George O. (2002). «The Weber problem». Facility Location: Applications and Theory. Springer, Berlin. pp. 1-36. MR1933966.
Krarup y Vajda, 1997. Krarup, Jakob; Vajda, Steven (1997). «On Torricelli's geometrical solution to a problem of Fermat». IMA Journal of Mathematics Applied in Business and Industry8 (3): 215-224. MR1473041. doi:10.1093/imaman/8.3.215.
Drezner et al. (2002)Drezner, Zvi; Klamroth, Kathrin; Schöbel, Anita; Wesolowsky, George O. (2002). «The Weber problem». Facility Location: Applications and Theory. Springer, Berlin. pp. 1-36. MR1933966.
Krarup y Vajda, 1997. Krarup, Jakob; Vajda, Steven (1997). «On Torricelli's geometrical solution to a problem of Fermat». IMA Journal of Mathematics Applied in Business and Industry8 (3): 215-224. MR1473041. doi:10.1093/imaman/8.3.215.