The estate of Walter De Maria, the reclusive US artist who died last year without leaving a will, is now represented by Gagosian Gallery (FL, C3; FM, C2). Best known for large-scale installations such as "The New York Earth Room," 1977, and "The Lightning Field," 1977, in New Mexico, De Maria had six solo shows with the gallery during his lifetime. Gagosian is due to mark the new relationship by staging an exhibition of Minimalist sculptures and works on paper that were created by the artist between 1976 and 1990.