1. Preparation of stable magnetorheological fluids based on extremely bimodal iron-magnetite suspensions;Lopez-Lopez;J. Mater. Res.,2005
2. D.C. Johnson, Thermodynamics of the van der Waals fluid, arXiv: (2014) 1402.1205v1 (cond.mat.soft}.
3. J. Israelachvili, Intermolecular & Surface Forces. 2nd Ed., 1995, Academic Press, Fig. 11.1.
4. J. Israelachvili, op. cit., Table 11.2.
5. The image of a pole is opposite in sign and located an equal distance behind a surface, see for example Jackson, J.D., Classical Electrodynamics, 2nd Ed. (1975) John Wiley & Sons, p54. Dipoles are opposite polarities of poles located a small distance apart. Each pole of the dipole has it own image with the resulting dipole image indicated in Fig. 4.