To make any of the algorithms useful for a real OLT system, they have 
to be further developed. A key point is the data structure. The present 
versions rely on the "unlimited" space in the primary storage of a big 
computer, which will hardly be available on an analytical plotter or on 
a computer beside a monocomparator. 
ACKNOWLEDGEMENTS 
The author wish to express his gratitude to those having contributed to 
the present work. Special thanks to professor Armin Grün at ETH, 
Zürich, for making the TFU program avallable for the test, and to 
Norges Tekniske Hagskoles Fond for financial support. 
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/4/ Grün À.: An optimum algorithm for on-line 
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