The articles translated originally were published in Rocznik Kaliski in 2005 and 2010. An author associated with both articles was A. Kędzierski, perhaps the foremost authority on cross denarii in Poland. The articles translated are:
Kędzierski, A., Miłek, S. 2005. Mennica denarów krzyżowych w Kaliszu. Rocznik Kaliski 31, pp. 227-236.
Kędzierski, A. 2010. Czy istnieją denary krzyżowe Władysława Hermana? Rocznik Kaliski 36, pp. 255-262.
Kędzierski’s more recent works, of course, supersede and supplement these articles, but I thought it was still worth translating for better understanding the later works. The articles were translated strictly for use in personal scholarship. The translations can be accessed at the links below.
Northcoast Antiquarian 