@article{SM_2005_196_8_a0,
     author = {A. I. Aptekarev and G. L\'opez Lagomasino and I. Alvarez Rocha},
     title = {Ratio asymptotics of {Hermite--Pad\'e} polynomials for {Nikishin} systems},
     journal = {Sbornik. Mathematics},
     pages = {1089--1107},
     publisher = {mathdoc},
     volume = {196},
     number = {8},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2005_196_8_a0/}
}