1. Das Gesetz de Transformation der Knochen;Wolff,1892
2. Russians discuss space radiation in conference;David;Missiles and Rockets,1963
3. Bone demineralisation of foot and hand on Gemini-Titan IV, V and VII astronauts during orbital flight;Mack;Am J Roentgenol,1967
4. Mineral intake and bone loss;Hegsted;Fed Proc,1967