25910 Jan Boeyens: A molecular-structure hypothesis. Intl. J. Mol. Sci. 11 (2010), 4267-4284. 29558 Jan Boeyens/Peter Comba: Chemistry by number theory. Struct. Bond. 148 (2013), 1-24. 25911 Jan Boeyens/Demetrius Levendis: Number theory and the periodicity of matter. Springer 2008, 390p. Eur 113. 25909 Jan Boeyens/Demetrius Levendis: All is number. Internet ca. 2013, 19p.