Winter, Oil paintings
N° 144, The Great Elysian Fields, 78 x 109 cm, signed on the bottom right corner, 1979,
N° 124, Snow Thaw, 80 x 105 cm, signed on the bottom left corner, 1977,
N° 41, To Reinickendorf, 80 x 109 cm, signed on the bottom left corner, 1963.
(...) Style as alibi. Altrock has absolute mastery in engraving. His graphic work is rich and far from being just "graphics" on the opposite. It shows an endless panel of gradations.
(Der Tagesspiegel, September 15, 1971, phg)