Zimmermann wrote an account of his experiences in Yugoslavia, "The Origins Of A Catastrophe" (1996). According to what he wrote in the book, Franjo Tuđman claimed that Bosnia should be divided between the Croats and the Serbs in what came to be known as the Karađorđevo agreement. ""Tuđman admitted that he discussed these fantasies with Milošević, the Yugoslav Army leadership and the Bosnian Serbs,"" writes Zimmerman, ""and they agreed that the only solution is to divide up Bosnia between Serbia and Croatia"".