[NOTE: In the following pages I shall use extracts from research papers and books which make points of interest. To help you track the references back to those papers, I use the standard system known as a ‘citation’ which gives credit to the author(s) and the original paper. The expression ‘et al’ means that more than one person was responsible for the research.]
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Photo credit Paul Townsend https://www.flickr.com/photos/brizzlebornandbred/20001313491