Manning, Christopher D.; Raghavan, Prabhakar; Schütze, Hinrich. Introduction to Information Retrieval. Cambridge University Press. [2022-10-28]. (原始内容存档于2022-12-13).
tartarus.org
Martin Porter. Porter Stemmer. [2022-10-28]. (原始内容存档于2012-05-14).
Manning, Christopher D.; Raghavan, Prabhakar; Schütze, Hinrich. Introduction to Information Retrieval. Cambridge University Press. [2022-10-28]. (原始内容存档于2022-12-13).