Abstract
We gratefully acknowledge Editor-in-Chief Professor Endre Boros, and the Publications Managers Katie d’Agosta and Ann Pulido for supporting us in organizing this special issue. We sincerely thank all the authors who made excellent contributions and the reviewers who provided their helpful suggestions. Jun Pei would like to acknowledge the support by the National Natural Science Foundation of China (Nos. 71922009, 72071057, 71871080, 72188101).
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