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Abstract
Liquid crystals have become an object for the attention of investigators from many countries for about twenty years. This is due, first of all, to their practical applications. These are really numerous: indicators for electronics, thermoindicators, analyzers for the pollution of the environment, means for the visualization of pictures, designs of optical treatment of information, etc. Besides, liquid crystals are unique compounds of great interest from the viewpoint of the molecular physics of the condensed state.
