@article{AM2_1990__40_1_137369,
     author = {H. Kraljevic and J. Pecaric},
     title = {Some {Landau's} type inequalities for infinitesimal generators.},
     journal = {Aequationes mathematicae},
     pages = {147--153},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {1990},
     zbl = {0738.47033},
     url = {http://geodesic.mathdoc.fr/item/AM2_1990__40_1_137369/}
}