@article{IJAMCS_2001_11_4_a9,
     author = {Kaczorek, T.},
     title = {Externally and {Internally} {Positive} {Time-Varying} {Linear} {Systems}},
     journal = {International Journal of Applied Mathematics and Computer Science},
     pages = {957--964},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJAMCS_2001_11_4_a9/}
}