books.google.cl - Contents - 1. The Principles of Superposition; 2. Dynamical Variables and Observables; 3. Representations; 4. The Quantum Conditions; 5. The Equations of Motion; 6. Elementary Applications; 7. Perturbation Theory; 8. Collision Problems; 9. Systems Containing Several Similar Particles; 10. Theory of Radiation;...http://books.google.cl/books/about/The_Principles_of_Quantum_Mechanics.html?id=XehUpGiM6FIC&q=quantities&utm_source=gb-gplus-shareThe Principles of Quantum Mechanics
