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Combining the quasi stationary principle with velocity_ profile properties of respective steady flow and SliozkinTarg's approximation we introduce a method to solve a class of problems on unsteady flow of vis~ousplastic fluid in pipe lines. Using this method we solve the problems on unsteady pressure flow in the horizontal cylindrical tube. We also compare the obtained results with those of Tiabin showed in [1].

On a class of problems on unsteady flow of viscous-plastic fluids in pipe-line