  Analitical calculations have been used to describe the calorimeter event
selection in small-angle electron-positron scattering at LEP1. The first-order
QED correction to the Born cross-section has been derived with leading log and
the next-to-leading log approximations. The second- and the third-order
corrections were computed with leading accuracy. The present analytical results
are illustated by Tabeles and compared with the corresponding results obtained
with the Monte Carlo generator BHLUMI.
