I found this 2004 piece (pdf) by Shmuel Bar. It has numerous interesting and detailed points, though I do not think it can be considered objective. Here is one excerpt: Iranian negotiators are methodical and have demonstrated a high level of preparations and a detailed and legalistic attitude. On the other hand, their communication tends […]
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https://marginalrevolution.com/marginalrevolution/2013/11/the-literature-on-iranian-negotiation-techniques.html