{"id":"chao1984nonparametric","URL":"https://www.jstor.org/stable/4615964","type":"article-journal","title":"Nonparametric estimation of the number of classes in a population","author":[{"given":"Anne","family":"Chao"}],"issued":{"date-parts":[[1984]]},"year-text":"1984","container-title":"Scandinavian Journal of Statistics","catalog-key":"SRC0D8MQD2P55M9"}