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xii                                        Preface to the Third Edition

                         As other authors will know, the preparation of  a textbook is a demanding,
                       challenging and  time-consuming occupation. I  have  been  very  fortunate  to
                       receive  many  encouraging comments on  the  previous  editions and  this  has
                       given me  the  enthusiasm to  continue developing the  subject material in  the
                       book. I am very grateful to all of those who have taken the trouble to contact
                       me in the past and I continue to welcome comments and advice as to how the
                       book could be improved in the future.
                                                                              R.J. Crawford
                                                                            September 1997
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