The problems contained in this series have been collected over
many years with the aim of providing students and teachers
with material, the search for which would otherwise occupy much
valuable time. Hitherto this concentrated material has only
been accessible to the very restricted public able to read Serbian*.
I greatly welcome the appearance of the Tutorial Texts based
on my problem collection. Cooperation with colleagues in
Australia and the U.S.A. and their initiative have made it possible.
For the preparation of this Text, I wish to thank E. S. Barnes
and J. R. M. Radok.