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I had a look at the Bulgarian article, but it's not so easy to translate, even with the help of my Bulgarian physicist girlfriend. The problem is that Georgi Nadjakov and Chester Carlson both conducted experiments leading to the photocopier. It's difficult, however, to understand how the experiments were essentially different. More difficult to understand is how the ideas came together. The Bulgarian article emphasizes that Nadjakov's experiments were one year earlier. But there's no clue as to whether Carlson was aware of Nadjakov's experiments. The Chester Carlson article doesn't mention Nadjakov. In fact, the Carlson article cites a recent biography, "Copies in Seconds" by David Owen, which also fails to mention Nadjakov (I looked at the book's index online at Amazon). Only the photocopier article mentions Nadjakov. I found the Bulgarian article to be interesting, but it deserves to be translated by someone who can sort out some of the issues of who should get credit for what. --Dale Gerdemann16:00, 14 May 2006 (UTC)[reply]