@book {Wyckoff1963, title = {Crystal Structures 1}, series = {Crystal Structures}, volume = {1}, year = {1963}, publisher = {Interscience Publishers}, organization = {Interscience Publishers}, edition = {2nd}, address = { New York, New York}, url = {http://rruff.geo.arizona.edu/AMS/AMC_text_files/13434_amc.txt}, author = {Ralph W G Wyckoff} }