@article{ZNSL_2016_453_a11,
     author = {L. Yu. Kolotilina},
     title = {On block generalizations of $\mathcal H$-matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {172--188},
     year = {2016},
     volume = {453},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2016_453_a11/}
}