@article{PIM_1981_N_S_30_44_a24,
     author = {Katarina Surla},
     title = {Determination of the {Invariant} {Interval} for {Positive} {Linear} {Operators} by a {Nonstationary} {Iterative} {Procedure}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {177 },
     publisher = {mathdoc},
     volume = {_N_S_30},
     number = {44},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1981_N_S_30_44_a24/}
}