Gold Bulletin
Gold Bulletin > 2007 > 40 > 3 > 206-212
Gold Bulletin > 2012 > 45 > 3 > 153-160
Gold Bulletin > 2012 > 45 > 4 > 203-211
Gold Bulletin > 2016 > 49 > 1-2 > 1-7
Gold Bulletin > 2018 > 51 > 1-2 > 35-44
Gold Bulletin > 2018 > 51 > 4 > 185-195