@article{JMAG_2000_7_2_a6,
     author = {S. Kupin},
     title = {Abstract interpolation problem and four-block problem},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {219--230},
     year = {2000},
     volume = {7},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2000_7_2_a6/}
}