@ARTICLE\{IMM1988-02577, author = "S. Vibholm and P. Thyregod", title = "A study of the up and down method for nonnormal distribution functions", year = "1988", pages = "357-364", journal = "{IEEE} transactions {EI}", volume = "EI-23", editor = "", number = "", publisher = "", url = "http://www2.compute.dtu.dk/pubdb/pubs/2577-full.html" }