Equilibrium thermodynamics was an achievement of the nineteenth century, nonequilibrium thermodynamics was developed in the twentieth century, and Onsager's relations mark a crucial point in the shift of interest away from equilibrium to non-equilibrium.
p. 138 as cited in: Kenneth D. Bailey (1994) Sociology and the New Systems Theory. p. 122. - Order Out of Chaos: Man's New Dialogue with Nature (1984)