Note added in proof polarized deep inelastic scattering

Note added in proof polarized deep inelastic scattering 

In Sections 15.6, 16.8 and 17.1.2 we emphasized the consequences of the European Muon Collaboration s (EMC) unexpected results in an experiment in 1987 on polarized deep inelastic lepton-hadron scattering, and we stressed the importance of testing the Bjorken sum rule by comparing neutron and proton data. 

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