1. 1) F.H. Clements: Journal of I. and S. Inst., 1922, Vol. 105.
2. 2) T.P. Golcough: Journal of I. and S. Inst., 1956, Vol. 166, p. 187.
3. 3) W.E. Groume-Grjimailo: "The Flow of Gases in Furnaces". 1923.
4. 4) F.H. Norton: Jour. of the Amer. Ceram. Soci., 1924, Vol. 7.
5. 6) F.C. Johausen: Proceedings of the Inst. of Mech. Eng., 1929, No. 2.