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Simpson, Fronia, and Sigmar Polke. Sigmar Polke: San Francisco Museum of Modern Art. [Ed.: Fronia Simpson]. San Francisco, Calif.: San Francisco Museum of Modern Art, 1990.

Simpson, Fronia, and Sigmar Polke. Sigmar Polke: San Francisco Museum of Modern Art. [Ed.: Fronia Simpson]. San Francisco Museum of Modern Art, 1990.