@article{702391,
     title = {The optimal control problem in coefficients for the pseudoparabolic variational inequality},
     booktitle = {Equadiff 7},
     series = {GDML\_Books},
     publisher = {BSB B.G. Teubner Verlagsgesellschaft},
     address = {Leipzig},
     year = {1990},
     pages = {232-235},
     zbl = {0713.49015},
     url = {http://dml.mathdoc.fr/item/702391}
}

Bock, I.; Lovíšek, J. The optimal control problem in coefficients for the pseudoparabolic variational inequality, dans Equadiff 7, GDML_Books,  (1990), pp. 232-235. http://gdmltest.u-ga.fr/item/702391/