1. Introduction 285
2. Contact Interaction between the Electron and Nuclear Spins 286
3. Saturation of Paramagnetic Resonance 288
4. Hyperfine Structure of Paramagnetic Resonance 290
5. Overhauser Effect with Complete Saturation of all Components 291
6. Overhauser Effect in Metals 293
7. Overhauser Effect in Liquid and Solid Diamagnets with Paramagnetic Impurities 298
8. Overhauser Effect in Paramagnetic Salts and Semiconductors 304
9. Overhauser Effect in Alkali-Halide Crystals and Alkali-Ammonia Solutions 308
10. Overhauser Effect from the Point of View of General Principles of Statistical Physics and Thermodynamics 309
11. Nonstationary Methods 310
12. Conclusion 317