2Rivlin.V.G.o Critical review of constitution of Carbon- chromium-iron mad Carbon-manganese, systems[J].International Matals Reviews, 1984, 29(4):299- 377.
3G.Pavlovic and A.M.Tekalp.Maximum likelihood parametric blur identification based on a continuous spatial domain model[J].IEEE Trans.Image Proc.,1992,1(10):496-504.