 Initially Paltridge (1975) used the terminology "minimum entropy exchange", but after that, for example in Paltridge (1978), and in Paltridge (1979)), he used the now current terminology "maximum entropy production" to describe the same thing.This point is clarified in the review by Ozawa, Ohmura, Lorenz, Pujol (2003).Paltridge (1978) cited Busse's (1967) fluid mechanical work concerning an extremum principle.