Geodesic
Abstract interpolation problem and four-block problem
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 7 (2000) no. 2, pp. 219-230 
S. Kupin. Abstract interpolation problem and four-block problem. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 7 (2000) no. 2, pp. 219-230. http://geodesic.mathdoc.fr/item/JMAG_2000_7_2_a6/
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     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/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

We treat a four-block problem as an abstract interpolation problem with an appropriately chosen data. This approach enables us to obtain a description of all solutions for the four-block problem.