@article{10_21136_AM_1968_103198,
     author = {Dole\v{z}al, V\'aclav},
     title = {On general feedback systems containing delayers},
     journal = {Applications of Mathematics},
     pages = {489--507},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {1968},
     doi = {10.21136/AM.1968.103198},
     mrnumber = {0242522},
     zbl = {0165.43105},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1968.103198/}
}