TY - JOUR AU - Kaczorek, T. TI - Externally and Internally Positive Time-Varying Linear Systems JO - International Journal of Applied Mathematics and Computer Science PY - 2001 SP - 957 EP - 964 VL - 11 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IJAMCS_2001_11_4_a9/ LA - en ID - IJAMCS_2001_11_4_a9 ER -