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"The subject of this book is an important one for new generations of astronomers. ... The book would be an excellent foundation for a postgraduate course, and it is clear that students who completed it successfully and are inspired by the subject would be well-equipped for research. ... Professor Maciel's book is a fine addition to the astronomical literature and should be found along with those volumes on the shelves of all astronomical libraries." (David A. Williams, The Observatory, Vol. 134 (1240), June, 2014)