Capelotti , P. J., Herman Van Dyk, and Jean-Claude Cailliez. 2007. “Strange Interlude at Virgohamna, Danskøya, Svalbard, 1906: The Merkelig Mann, the Engineer and the Spy”. Polar Research 26 (1):64-75. https://doi.org/10.3402/polar.v26i1.6208.