@article{BMMS_2013_36_4_a9,
     author = {Ahmed A. M. Kamal and Khalid H. Al-Shaalan}},
     title = {Generalization of {Posner's} {Theorems}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2013},
     volume = {36},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2013_36_4_a9/}
}