1. R. H. Long, Jr., Experimental and theoretical study of transverse vibration of a tube containing flowing fluid, A.S.M.E., Preprint 54-A-22
2. Vibrations of a cylindrical tube containing flowing fluid;Niordson, Frithiof I. N.;Trans. Roy. Inst. Tech. Stockholm,1953
3. Lothar Collatz, Eigenwertprobleme, Chelsea Publishing Co., New York, 1948, p. 305 ff.
4. L. Collatz, Ibid, p. 54
5. L. Collatz, Ibid, p. 84