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...rements provide optimal guarantees, which are comparably easy to derive, many applications demand for more structure in the measurement process. A particular instance is the matrix completion problem =-=[22, 17, 19, 35, 21]-=-, which aims at recovering missing entries of a matrix which is known to be of low rank. Here, the source of randomness is in the selection of the known entries. In contrast to the unstructured measur...