1. C. C. Bradley (Science [2] 138 [1962] 489/91).
2. S. Clodius (Gas-Wasserfach 110 [1969] 1335/7; Wasser Luft Betrieb 14 [1970] 11/4).
3. L. C. N. Burgess (J. Am. Water Works Assoc. 62 [1970] 211/4).
4. A. Cywin (Mech. Eng. 93 No. 10 [1971] 7/10; Comments by D. E. Bluman, Mech. Eng. 93 No. 12 [1971] 56; Reply by Cywin, Mech. Eng. 94 No. 2 [ 1972 ] 54 ).
5. J. H. McDermott (Proc. ASCE J. Environ. Eng. Div. 99 [1973] 469/78).