1- http://www.sciencedirect.com/science/article/pii/0375947468906994
2- http://www.sciencedirect.com/science/article/pii/0375947467905106
3- http://prc.aps.org/abstract/PRC/v68/i3/e034324
4- http://prc.aps.org/abstract/PRC/v5/i5/p1472_1
5- http://iopscience.iop.org/1063-7869/39/9/R03
email: hmzeyada(at)gmail.com
ولكم خالص الشكر
2- http://www.sciencedirect.com/science/article/pii/0375947467905106
3- http://prc.aps.org/abstract/PRC/v68/i3/e034324
4- http://prc.aps.org/abstract/PRC/v5/i5/p1472_1
5- http://iopscience.iop.org/1063-7869/39/9/R03
email: hmzeyada(at)gmail.com
ولكم خالص الشكر