@article{ARM_2008_44_3_a6,
     author = {Abdel-Baky, Rashad A. and Al-Bokhary, Ashwaq J.},
     title = {A new approach for describing instantaneous line congruence},
     journal = {Archivum mathematicum},
     pages = {223--236},
     year = {2008},
     volume = {44},
     number = {3},
     mrnumber = {2462978},
     zbl = {1212.53001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2008_44_3_a6/}
}