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[4] Richert, R. and Weinstein, S., Nonlinear Dielectric Response and Thermodynamic Heterogene- ity in Liquids. Phys. Rev. Lett. 97 , 095703 (2006). 

[5] Weinstein, S. and Richert, R., Nonlinear features in the dielectric behaviour of propylene glycol. Phys. Rev. B 75 , 064302 (2007). 

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[7] The Debye dynamics can be also obtained by starting with the non inertial Langevin equation for the roational Brownian motion of a particule, by appropriate transformation of the variables and direct averaging of the stochastic equation so obtained. 

