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2 “...This book presents fourteen state-of-the-art research papers prepared by research scientists...”

3 “... is expected to continue. This book contains state-of-the-art work that should guide your research....”

4 “...In this Special Issue, we address the state of the art of the systematics of the main annelid...”

5 “... in the past.Finally, the reader can learn about the state-of-the-art of education initiatives to train site managers...”