Sinkov, Abraham Elementary cryptanalysis: a mathematical approach. 6th print. (English) Zbl 0955.94007 New Mathematical Library. 22. Washington, DC: MAA, Mathematical Association of America. 222 p. (1998). Reviewer: K.-H.Zimmermann (Hamburg) MSC: 94A60 94-01 PDFBibTeX XMLCite \textit{A. Sinkov}, Elementary cryptanalysis: a mathematical approach. 6th print. Washington, DC: MAA, Mathematical Association of America (1998; Zbl 0955.94007)
Honsberger, Ross Ingenuity in mathematics. 6th printing. (English) Zbl 0935.00001 New Mathematical Library. 23. Washington, DC: Mathematical Association of America. vii, 206 p. (1998). Reviewer: C.Alsina (Barcelona) MSC: 00A05 00A99 00-01 PDFBibTeX XMLCite \textit{R. Honsberger}, Ingenuity in mathematics. 6th printing. Washington, DC: Mathematical Association of America (1998; Zbl 0935.00001)