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      <subfield code="a">Bona, Carles</subfield>
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      <subfield code="a">Fustero, X. (Xavier)</subfield>
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      <subfield code="a">Verdaguer Oms, Enric, 1950-</subfield>
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      <subfield code="a">We propose a definition of classical differential cross sections for particles with essentially nonplanar orbits, such as spinning ones. We give also a method for its computation. The calculations are carried out explicitly for electromagnetic, gravitational, and short-range scalar interactions up to the linear terms in the slow-motion approximation. The contribution of the spin-spin terms is found to be at best 10-6 times the post-Newtonian ones for the gravitational interaction.</subfield>
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