@article{10_4064_ap_53_3_237_252,
     author = {Jerzy Ombach},
     title = {Sinks, sources and saddles for expansive flows with the pseudo-orbits tracing property},
     journal = {Annales Polonici Mathematici},
     pages = {237--252},
     publisher = {mathdoc},
     volume = {53},
     number = {3},
     year = {1991},
     doi = {10.4064/ap-53-3-237-252},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-53-3-237-252/}
}