Kalcijum u biologiji — разлика између измена

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* {{Cite book |chapter=The Parathyroid Glands and Vitamin D |author=Boron, Walter F.; Boulpaep, Emile L |title=Medical Physiology: A Cellular And Molecular Approach |publisher=Elsevier/Saunders |year=2003 |id=ISBN 1-4160-2328-3 |page=1094|ref=harv}}