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A few references for those interested in going further: Hukushima et al (1996) https://t.co/sncNvHHMof An interesting paper by Enzo Marinari: https://t.co/yEwI7Op9mB Katzgraber et al (2006): https://t.co/HGpIVWezkp Guidetti et al (2012) https://t.co/