Document downloaded from: This paper must be cited as: The final publication is available at Copyright http://dx.doi.org/10.1016/j.fss.2012.11.001 http://hdl.handle.net/10251/38101 Elsevier Gregori Gregori, V.; Morillas, S.; Roig, B. (2013). Fuzzy quasi-metrics for the Sorgenfrey line. Fuzzy Sets and Systems. 222:98-107. doi:10.1016/j.fss.2012.11.001.