1. V. N. Bogoslovsky, Building heat mode (Moscow: Stroyizdat,1979).
2. A. M. Shklover, Heat transfer in periodic heat effects (Moscow: Gosenergizdat, 1961), p. 160.
3. V. N. Bogoslovsky, Heat physics (Moscow: Stroyizdat, 1980), p. 382.
4. A. G. Sotnicov, Air conditioning and ventilation systems with variable air pollution (Leningrad: Stroyizdat. 1984), p.148.
5. L. B. Ouspensky, Mathematical statistics in ventilation (Moscow: Stroyizdat, 1980), p. 108.