@article{Melnik_1997 author = {Valeriy S. Melnik}, title = {On Extremal Problems for Object Described by Nonlinear Operator Equations and Variational Inequalities.
Part I}, journal = {Journal of Automation and Information Sciences}, issn = {1064-2315}, year = {1997}, volume = {29}, number = {6}, pages = {32--41} }