@article{SM_2023_214_1_a3,
     author = {S. A. Nazarov},
     title = {`Far interaction' of small spectral perturbations of the {Neumann} boundary conditions for an elliptic system of differential equations in a~three-dimensional domain},
     journal = {Sbornik. Mathematics},
     pages = {58--107},
     publisher = {mathdoc},
     volume = {214},
     number = {1},
     year = {2023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2023_214_1_a3/}
}