@article{NUMA_1991__59_8_133552,
     author = {Lucio Torelli},
     title = {A sufficient condition for {GPN-stability} for delay differential equations.},
     journal = {Numerische Mathematik},
     pages = {311--320},
     publisher = {mathdoc},
     volume = {59},
     number = {8},
     year = {1991},
     zbl = {0712.65079},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__59_8_133552/}
}