KUNJU MOL RAJ, Robin, Pavel DLOUHÝ,
Vilém KOVAČ and
Libuše TURINSKÁ. Investing in Pairs of Precious Metals: Portfolio Theory Application.
Acta Montanistica Slovaca. Košice: Technical University of Košice, 2023, vol. 28, No 4, p. 941-951. ISSN 1335-1788.