  In a previous analysis of electroproduction of hypernuclei the cross sections
were calculated in distorted-wave impulse approximation where the momentum of
the initial proton in the nucleus was set to zero (the frozen-proton
approximation). In this paper we go beyond this approximation assuming a non
zero effective proton momentum due to proton Fermi motion inside of the target
nucleus discussing also other kinematical effects. To this end we have derived
a more general form of the two-component elementary electroproduction amplitude
(Chew-Goldberger-Low-Nambu like) which allows its use in a general reference
frame moving with respect to the nucleus-rest frame. The effects of Fermi
motion were found to depend on kinematics and elementary amplitudes. The
largest effects were observed in the contributions from the longitudinal and
interference parts of the cross sections. The extension of the calculations
beyond the frozen-proton approximation improved the agreement of predicted
theoretical cross sections with experimental data and once we assumed the
optimum on-shell approximation, we were able to remove an inconsistency which
was previously present in the calculations.
