@article{10_4064_sm223_3_4,
     author = {Bernd Carl and Andreas Defant and Doris Planer},
     title = {Weyl numbers versus $Z${-Weyl} numbers},
     journal = {Studia Mathematica},
     pages = {233--250},
     year = {2014},
     volume = {223},
     number = {3},
     doi = {10.4064/sm223-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm223-3-4/}
}