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2. B. Steinbach, Solution of Boolean differential equations and their application for binary systems. Original title: Lösung binärer Differentialgleichungen und ihre Anwendung auf binäre Systeme (in German). Ph.D. Thesis. Technische Hochschule Karl-Marx-Stadt; now: University of Technology Chemnitz, 1981
3. B. Steinbach, C. Posthoff, Boolean Differential Equations (Morgan & Claypool Publishers, San Rafael, 2013). https://doi.org/10.2200/S00511ED1V01Y201305DCS042. ISBN: 978-1-6270-5241-2
4. B. Steinbach, C. Posthoff, Derivative operations for lattices of Boolean functions, in Proceedings Reed-Muller Workshop 2013 (RM. Toyama, 2013), pp. 110–119. https://doi.org/10.13140/2.1.2398.6568