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Abstract A C K N 0 W l. E D G E M E N T I am genuinely grateful to Professor Doctor Kairy Abdel-Dayem. He has taught me to be accurate in choosing my words and to be clear in expressing my meaning. I am deeply touched that despite his numerous responsibilities, he always gave me prompt advice and gentle welcome. Dr. Wagdy Abdel-Hamid was the continuous source of gentleness, kindness and encouragement. He had immense patience and forbearance in supervising my work. I deeply thank them both. |