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Dedicated to my mentor, Prof. (Dr.) Ram Chandra, from whom I continue to learn, and to my family for their unconditional support, patience, understanding, encouragement, blessings, and love. —Vineet Kumar Dedicated to my family for their support, love, and educating me to date. —Muhammad Bilal Dedicated to my students, teachers, and mentors, from whom I continue to learn, and to my family for their support, blessings, motivation, and love. —Sushil Kumar Shahi This book is truly dedicated to my family for their abundant and endless support, love, and educating me to date; without them this book would not have been possible. —Vinod Kumar Garg Dedication