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- The X rays: Their production and application by Kolle, Frederick Strange (1898). available in print
- Zahlentheorie by Hensel, Kurt (1913). available in print
- Zur Formation Quadratischer Gleichungen by Bardley, Ernst (1884). available in print
- Zur Geschichte der Theorie der elliptischen Transcendenten in 1826-29 by Koenigsberger, Leo (1879). available in print
- Zur Reduction Elliptischer Integrale in Reeller Form by Scheibner, W. (1879). available in print