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We consider the shape of the curves of "Andreev" conductance of non-ballisticpoint contact NS heterosystems depending on the bias voltage at the contact.The obtained shape of those curves is caused by the contribution from themechanism of coherent scattering by impurities which doubles the scatteringcross section. The behavior of generalized and differential conductance iscompared for ballistic and non-ballistic transport regimes. The criteria areconsidered allowing one to discriminate between those regimes with thecorresponding conduction curves similar in appearance. The analysis is extendedto the case of non-ballistic transport in NS point contacts with exoticsuperconductors, molybdenum carbide Mo-C and oxypnictideLa[O$_{1-x}$F$_{x}$]FeAs from a group of iron-based superconductors.

Conductance of non-ballistic point contacts in hybrid systems "normal metal/superconductor" Cu/Mo-C and Cu/LaOFFeAs