s, Petr\ a\v, Y Chen, and C. Coopmans. 2009. “Fractional-order memristive systems”. In ETFA 2009 - 2009 IEEE Conference on Emerging Technologies and Factory Automation.
Podlubny, I., and Y Chen. 2008. “Adjoint fractional differential expressions and operators”. In 2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, DETC2007, 5 PART B:1385-90.