@article{IVM_2012_4_a5,
     author = {M. I. Kovalyova and V. A. Kostin and Yu. I. Sapronov},
     title = {Formation of nonsmoothness lines in optimization of screw pairs in screw pumps},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {53--64},
     publisher = {mathdoc},
     number = {4},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2012_4_a5/}
}