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2. Changes in the optical density of bone tissue and in the calcium metabolism of astronauts, A G Nikovaev and V I Sevastianov, Moscow;Biriukov, E.N.; Krasnykh, I.G.;Kosmicheskaia Biologiia i Meditsina (Moskva),1970
3. Mineral and nitrogen metabolic studies. Experiment MO 71. Biomedical results from Skylab;18, Chapter;NASA SP
4. In: Skeletal response. Biomedical results of Apollo;Rambaut, P.C.; Smith, M.C.; Mack, P.B.; Vogel, J.M.;NASA SP,1975