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study for the oil painting „Blue Bird“, signed and dated „Dotrel 67“, oil on canvas, 18 1/2 x 23 in. (see Peter Dotrel. Seelenwelten, Lilly’s Art (ed.), Vienna 2015, p. 28, fig. 27.)
illustrated in: Peter Dotrel. Neue Welten, Lilly’s Art (ed.), Vienna 2016, p. 68, fig. 88.