Jalobeanu, C. “Information Storage and Retrieval Systems With Inexact Queries”. Anal. Numér. Théor. Approx. 10, no. 1 (February 1, 1981): 33–47. Accessed May 20, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1981-vol10-no1-art5.