CERN-LEP. Study of the production of charmed (D0, D+-, D*) mesons in e+ e- annihilations at the Z0 mass. An updated version, with a factor 3 times more statistics, can be found in PL 352B,479 (& lt;a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+1803& gt; RED = 1803 & lt;/a& gt;). ; Other ; The DSYS error is due to the error in the branching ratio.