P. O. Fagerholm, A. Thunberg Some Accuracy Tests with Hydrodist and Hi-Fix for Position Determination in Hydrographic Survey PDF (English)
Q. R. Robinson, J. A. Heffner Evalution of Lorac for Conducting Speed and Manoeuvring Trials of Naval Vessels PDF (English)
M. Deck, M. Louis, P. Didey Results of Trials on the Conditions under which the Tellurometer is Used PDF (English)
