“…[130] suggested an original procedure for the graphical representation of the copolymer composition dependencies on monomer feed composition, which, they believe, being the combination of O'Driscoll and Slocombe procedures, permits to eliminate their shortcomings. Considering multicomponent copolymerization theory, it is hard to overestimate the paper by Walling and Briggs [46] who managed to reduce the calculation of the azeotropic composition ~* j=l j=l Similar equations along with the various explicit forms of their solution were reported in a number of subsequent papers [99,[131][132][133][134], reviews [119,135,136], and in a monograph [6]. Note that having a physical meaning solutions ~* of both non-linear (4.13) and linear (4.14) sets of equations coincide as was conclusively proved in the general case at any m [46] and independently in the case of terpolymerization by virtue of another technique [137].…”