“…While the portion of the curve between the two spinodals is not obtainable, as it shows an increase in pressure for an increase in volume, the portions v rf р v р v rspf and v rspg р v р v rg can, in certain circumstances, be obtained. These regions have received some attention [1][2][3][4][5]. In all these studies, solution of equations by numerical approximation have been made.…”