Acknowledgments
We thank Dr. Maria Ferreira for her English language support. Finally, the authors
also express their thanks to the “Edições Piaget” and its CEO, Dr. António Oliveira
Cruz, for his understanding of fully allowing the use of some of the data contained
in the book “Princípios Fundamentais de Ecologia Física” published in 2014 by
Abel Rodrigues and Gabriel Pita in that publisher.
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