Sang-Woon Kim B. John Oommen Prototype reduction schemes applicable for non-stationary data sets. 209-222 2006 39 Pattern Recognit. 2 https://doi.org/10.1016/j.patcog.2005.07.012 https://www.wikidata.org/entity/Q60327959 db/journals/pr/pr39.html#KimO06