2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192322We calculate the unpolarised deep inelastic structure function of a relativistic deuteron within a covariant framework. An exact treatment of nucleon off-shell effects is shown to give corrections to the widely-used convolution model, even in impulse approximation. Neglecting off-shell effects in the extraction of the neutron structure function from deuterium data introduces errors of order $1-2\%$.9 pages LaTeX, 4 uuencoded figures, to appear in Physics Letters B, TPR-94-03; PSI-PR-94-15; ADP-93-227/T143Nuclear TheoryHigh Energy Physics - Phenomenologytext