Somia Saad Mohamed Saad <br/><br/>
Changes in Frequences of Double - Mode RR - Lyrae Stars in M15  /  
 ذوات الدوره المزدوجه فى الحشد RR - Lyrae دراسة التغير فى ترددات نجوم 15 M 
Somia Saad Mohamed Saad ; Supervised lmam I. Ahmed , Mohamed A. Sharaf , Mohamed S. Aboulazm 
 - Cairo :   Somia Saad Mohamed Saad ,   1997 
 - 231Leaves :   charts ;   30cm 
<br/><br/>Thesis(ph.D.) - Cairo University - Faculty of Science - Department of Astronomy and Meteorology