Improved approximations for minimum cardinality quadrangulations of finite element meshes
Matthias Müller-Hannemann
and Karsten Weihe
Proc. 5th Eur. Symp. Algorithms (ESA 1997), Lecture Notes in Computer Science 1284, Rainer Ernst Burkard
and Gerhard J. Woeginger, ed., Springer-Verlag, Sep 1997, pp. 364–377
Tech. report 559, Technische Univ. Berlin, Fachbereich Mathematik, 1997
ftp://ftp.math.tu-berlin.de/pub/Preprints/combi/Report-559-1997.ps.Z
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