1. H. Bruus and K. Flensberg, Introduction to Many-Body Quantum Theory in Condensed Matter Physics (Niels Bohr Inst., Copenhagen, 2002).
2. M. V. Sadovskii, Diagrammatics: Lectures on Selected Problems in Condensed Matter Theory (Inst. Elektrofiz. UrO RAN, Yekaterinburg, 2005; World Sci., Singapore, 2006).
3. R. C. Bourret, Nuovo Cim. 26, 1 (1962).
4. S. M. Rytov, Yu. A. Kravtsov, and V. I. Tatarskii, Introduction to Statistical Radiophysics, Part II: Random Fields (Nauka, Moscow, 1978) [in Russian].
5. V. A. Ignatchenko and R. S. Iskhakov, Sov. Phys. JETP 45, 526 (1977).