@article{10_4064_ap_32_2_187_205,
     author = {J. Kloch},
     title = {The sufficient condition for linear constant time-lag systems to be normal systems},
     journal = {Annales Polonici Mathematici},
     pages = {187--205},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1976},
     doi = {10.4064/ap-32-2-187-205},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-32-2-187-205/}
}