Gold Bulletin
Gold Bulletin > 2007 > 40 > 4 > 278-282
Gold Bulletin > 2013 > 46 > 1 > 3-11
Gold Bulletin > 2015 > 48 > 1-2 > 13-20
Gold Bulletin > 2017 > 50 > 3 > 247-257
Gold Bulletin > 2018 > 51 > 3 > 75-83
Gold Bulletin > 2019 > 52 > 1 > 51-60