found: Work cat.: Kopański, T.J. PZL.23 Karaś & export version, 2004:p. 16 (due to significant changes in the airframe design, the Bulgarian Karaś received the new designation PZL.43)
found: Wikipedia, 30 May 2008(the PZL.32 Karaś was a Polish light bomber and reconnaissance aircraft designed in the mid-1930s by PZL in Warsaw; it was the main Polish bomber and reconnaissance aircraft in the Invasion of Poland; sometimes the aircraft is called the "PZL P.23" but the letter "P" was generally fighters of Pulawski's design such as the the PZL P.11; variant PZL.43 Karaś)
found: Virtual Aircraft Museum website, 30 May 2008:Poland, PZL (PZL P-23 / P-43 Karas, light bomber)
