- Helmut Federle. Peintures, Dessins, 1989, Musée... Lot 706

- Helmut Federle. Peintures, Dessins, 1989, Musée de Grenoble - A traveling Retrospective Exhibition. Georges Vantongerloo, 1980, Washington Corcoran Gallery of Arts, Washington - Karl Benjamin. And The Evolution Of Abstraction. 1950-1980, 2011, Louis Stern fine arts, West Hollywood - Dance the line paintings by Karl Benjamin, 2007, Louise Stern fine arts, West Hollywood - K. V. Maur, Magie der Zahl, 1997, Staatsgalerie, Stuttgart - Die Sprache Der Geometrie, 1984, Kunstmuseum, Berne - The Non-Objective World. 1914-1924, 1970, Annely Juda Fine Art, Londres - The Non-Objective World Revisited, 1988, Annely Juda Fine Art, Londres - M. Tuchman, The Spiritual in Art, Abstract Painting 1890-1985, 1986, Abbeville Press - Conceptual abstraction, 1991, Sidney Janis Gallery, NY - Les Sujets de L'Abstraction, 2011, Musée Rath, Genève - Abstraction: Towards a New Art. Paintings 1910-1920, 1980, Tate Gallery, Londres - From Figuration To Abstraction, 1986, Annely Juda Fine Art/ Juda Rowan Gallery, Londres ]]> De gauche à droite: