1. International Archives of Photogrammetry, Vol. XII, Part I, page 215. Resolution 6 of Commission II.
2. Sign Convention and Notation;Thompson;The Photogrammetric Record,1957
3. Letter to the Editor, Sign Conventions and Notation;Arthur;The Photogrammetric Record,1957
4. G.H. Schut, Analytical Aerial Triangulation; Photogrammetria, Vol. XII, 4, p. 311.
5. A Stereocomparator Technique for Aerial Triangulation;Arthur;Ordnance Survey Professional Papers, New Series,1955