The Effect of Vibro-Finishing Treatment on The Porosity of the Surface Layer of Powder Metallurgy ProductsYuriy Ankudimov, Irina Sadovaya, Dieudonne Essola and Tatyana BagdasaryanMATEC Web Conf., 297 (2019) 04006DOI: https://doi.org/10.1051/matecconf/201929704006