@article{SM_2018_209_7_a1,
     author = {L. Baratchart and J. Leblond and F. Seyfert},
     title = {Constrained extremal problems in~$H^2$ and {Carleman's} formulae},
     journal = {Sbornik. Mathematics},
     pages = {922--957},
     publisher = {mathdoc},
     volume = {209},
     number = {7},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2018_209_7_a1/}
}