Two-Input Enzymatic Logic Gates Made Sigmoid by Modifications of the Biocatalytic Reaction Cascades. - Oleksandr Zavalov; Vera Bocharova; Jan Halamek; Lenka Halámková; Sevim Korkmaz; Mary A. Arugula; Soujanya Chinnapareddy; Evgeny Katz; Vladimir Privman (Int. J. Unconv. Comput., 2012)