@article{CC_2005_34_4_a10,
     author = {Knopik, Leszek},
     title = {Some results on the ageing class},
     journal = {Control and Cybernetics},
     pages = {1175--1180},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {2005},
     zbl = {1111.62014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2005_34_4_a10/}
}