themarksproject.orgUndatedARNTZ 2001Illustrated example dated 2001 in the source; this is an object date.
themarksproject.orgUndatedMichael ArntzIllustrated example dated 1992 in the source; this is an object date.
themarksproject.orgUndatedM. Arntz 2004Illustrated example dated 2004 in the source; this is an object date.