@article{ZNSL_1995_224_a20,
     author = {A. P. Oskolkov},
     title = {The penalty method for the equations of viscoelastic media},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {267--278},
     year = {1995},
     volume = {224},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1995_224_a20/}
}