%0 Journal Article %T A simple model illustrating the impossibility of measuring off-shell effects %A S. Scherer %A H. W. Fearing %J Physics %D 2000 %I arXiv %R 10.1016/S0375-9474(01)00476-6 %X We consider a simple model and make use of field transformations in Lagrangian field theories to illustrate the impossibility of measuring off-shell effects in nucleon-nucleon bremsstrahlung and related processes. %U http://arxiv.org/abs/nucl-th/0006076v1