  Memory circuit elements, namely memristive, memcapacitive and meminductive
systems, are gaining considerable attention due to their ubiquity and use in
diverse areas of science and technology. Their modeling within the most widely
used environment, SPICE, is thus critical to make substantial progress in the
design and analysis of complex circuits. Here, we present a collection of
models of different memory circuit elements and provide a methodology for their
accurate and reliable modeling in the SPICE environment. We also provide codes
of these models written in the most popular SPICE versions (PSpice, LTspice,
HSPICE) for the benefit of the reader. We expect this to be of great value to
the growing community of scientists interested in the wide range of
applications of memory circuit elements.
