Volodymyr K. was a very nice guy. He clearly knows what he is doing and he was very professional, to the point, without being in too much of a hurry (as some freelancers naturally are), but without taking time in superfluous things. Would recommend =).
Phase transitions at non-zero temperatures in ultracold Bose- and Fermi-particles mixture in optical lattices using the Bose-Fermi-Hubbard model in the mean field and hard-core boson approximations are investigated...
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