{\magtwo  References}
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\def\ref #1 #2 {
    \item {\hbox to \parindent {\bf \ [#1] \hfill}} #2}
\ref{AHU83} 
{A.V. Aho, J.E. Hopcroft, J.D. Ullman: ``Data Structures and 
Algorithms'', Addison-Wesley Publishing Company, 1983}
\medskip
\ref{DKMMRT88} 
{M. Dietzfelbinger, A. Karlin, K.Mehlhorn, F. Meyer 
auf der Heide, H. Rohnert, R. Tarjan: ``Upper and Lower Bounds for
the Dictionary Problem'', Proc. of the 29th IEEE Symposium on
Foundations of Computer Science, 1988}
\medskip
\ref{FT84} 
{M.L. Fredman, and R.E. Tarjan: ``Fibonacci Heaps and Their Uses in
Improved Network Optimization Algorithms'', 25th Annual IEEE Symp.
on Found. of Comp. Sci., 338-346, 1984}
\medskip
\ref{L89} 
{S.B. Lippman: ``\CC Primer'', Addison-Wesley, Publishing Company, 1989}
\medskip
\ref{M84} 
{K. Mehlhorn: ``Data Structures and Algorithms'', Vol. 1--3,
Springer Publishing Company, 1984}
\medskip
\ref{MN89} 
{K. Mehlhorn, S. N\"aher: `` LEDA, a Library of Efficient Data Types and
Algorithms'', TR A 04/89, FB10, Universit\"at des Saarlandes, 
Saarbr\"ucken, 1989}
\medskip
\ref{S86} 
{B. Stroustrup: `` The \CC Programming Language'', Addison-Wesley 
Publishing Company, 1986}
\medskip
\ref{T83} 
{R.E. Tarjan: ``Data Structures and Network Algorithms'',
CBMS-NSF Regional Conference Series in Applied Mathematics,
Vol. 44, 1983}

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