An ad as seen in de Volkskrant in 19-10-1991 https://www.delpher.nl/nl/kranten/view?query=%22Achter+tralies%22+%22Alfred+J.+Kwak%22&coll=ddd&sortfield=date&identifier=ABCDDD:010867088:mpeg21:a0053&resultsidentifier=ABCDDD:010867088:mpeg21:a0053&rowid=1