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On the occasion of DCI construction the question was advanced of possible improvements of usual methods concerning closed orbit correction. The calculations we expose here present two advantages : - The perturbations and corrections are not treated as pointlike dipoles, but inserted in lattice computation by their exactly corresponding transfer matrices. - The selection is not made among all possible correctors. A set of the statistically most efficient correctors is determined by a computational simulation.

I n March, I970, South Vietnamese Congressman Tran Ngoc Chau was sentenced to twenty years at hard labor, subsequently reduced to ten, by a military tribunal whose conduct of the trial was so outrageously biased that the South Vietnamese Supreme Court broke with the executive for the first time and reversed the decision, finding it unconstitutional. Despite the reversal, and despite a reaffirmation of the reversal in late October of 1970 by the appellate section of the Supreme Court, Chau remains in detention. 299 The Antioch Review