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June 2001. Ink drawing. | September 2001. Black and blue felttip pen. | September 2001. Black and red felttip pen. | November 2001. "Batman". Ink drawing. | Late 2001. Felttip pens and markers. |
March 1996. Ink drawing. | June 1998. "Beware! Clever Hans effect!" Ink drawing. | June 1998. "Gröhl!" or the beauty of bird song. Ink drawing. | April 1999. "Mouse lemur Heinz-Wilfried". Ink drawing. | October 1999. Black and green felttip pen. |
October 1994. Ink drawing. | November 1994. Ink drawing. | January 1995. Ink drawing. | March 1996. Ink drawing. | March 1996. Ink drawing. |
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