Citation: Rutzinger, D.; Doert, Th.; Ruck, M. (2009). Incommensurately modulated lanthanide coinage-metal diarsenides. I. CeAu~1{-~\d}As~2~ [\d = 0.015(2)] -- a new distortion variant of the HfCuSi~2~ type with irregularly stacked cis--trans chains of arsenic atoms. Acta Crystallographica Section B, 65, pp. 519-526.