| http://www.w3.org/ns/prov#value | - are the structures having dimensions bx(l,m), by(l,m), m is a natural number comprised between 1 and M, and M is the number of columns of the matrix the elements of which are the structures having dimensions bx(l,m), by(l,m); at least one matrix code having a wavelength determined univocally from the wavelength at which each element of the matrix (5) generates a particular value of relative magne
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