During the workshop ``Transversity: New Developments in Nucleon Spin Structure'' (ECT*, Trento, Italy, 14--18 June 2004), a series of recommendations was put forward by the participants concerning definitions and notations for describing effects of intrinsic transverse-momentum of partons in semi-inclusive deep inelastic scattering.
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Bacchetta et al. (2004) studied this question.
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