@article{MTA_2018_3_1_a5,
     author = {Sergiy Zhuk and Olexander Nakonechnii},
     title = {Minimax state estimates for abstract {Neumann} problems},
     journal = {Minimax theory and its applications},
     year = {2018},
     volume = {3},
     number = {1},
     zbl = {1384.93052},
     url = {http://geodesic.mathdoc.fr/item/MTA_2018_3_1_a5/}
}