- Books chapter
http://www.intechopen.com/download/pdf/40887
DOI 10.1007/978-90-481-9625-8_11
http://www.springerlink.com/content/n63t8856553j03ku/
http://www.editorial-bizancio.pt/coleccoes.php?col=19&id=397
http://www.editorial-bizancio.pt/coleccoes.php?col=19&id=397
http://www.humanapress.com
