@article{BMMS_2013_36_2_a5,
     author = {Amir Khosravi and M. Mirzaee Azandaryani},
     title = {G-Frames and {Direct} {Sums}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2013},
     volume = {36},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2013_36_2_a5/}
}