“…For basic point of view, the theory has been widely used independently (Lennard et al, 1986;Kumar et al, 1996Kumar et al, , 1997Tao et al, 1998;Bitao et al, 2000;Xiting et al, 2000;Yixiong et al, 2000) and also as a component of some other formulations (Northcliffe and Schilling, 1970;Ziegler et al, 1985). Till date, there is no suitable alternative to this theory.…”