Second Quantized Formalism
Modern many-electron theory: vacuum state, creation and annihilation of electrons, algebraic formulation of Pauli Principle. Particle number operators. Evaluation of matrix elements. Density matrices. Applications: perturbation theory of electron correlation, intermolecular interactions. The theory of the chemical bond.
L. D. Landau, L. M. Lifshitz, Quantum Mechanics: Non-relativistic Theory, Butterworth-Heinemann, 1981,
L.I. Schiff, Quantum Mechanics, Mcgraw-Hill College, 1968
or any other standard textbook in English P. R. Surján: Second Quantized Approach to Quantum Chemistry, Springer, Heidelberg, 1989