“…In these models, the non-periodicity is considered as introducing the effect of the disorder in the Schrödinger equation, and is taken into account in different ways, for example as non-analytic behavior in the potential 15 , incommensurate potential 16 , quasiperiodicity 17 , topological disorder connected to tesselation 18 , local bond-orientational order 19 , etc, these possibilities presenting also interdependences between them. This way of describing the disorder cannot be considered as representing the level of simple toy models only, since besides the fact that real physical systems holding such properties are known 2,15,16,19 , there are concrete cases where it is also known that a such type of representation (for example through quasiperiodicity) give analogous behavior for the system as random or disordered potentials 15,16 .…”