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1. Introduction; 2. History; 3. Quantities and quantity equations; 3.1. Definitions of quantities; 3.2. Quantities of the same kind; 3.3. Quantity equations and numerical value equations; 4. The equations of physics, definitional constants; 5. The problem of electrical quantities and units; 6. The International System of Units, the SI, a coherent system of units; 7. Biological quantities and units; 7.1. Photobiological quantities; 7.2. Quantities for ionizing radiation; 7.3. Biological quantities for medicine; 8. The use of the fundamental constants as reference quantities for the definition of units; 9. Final remarks
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