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1997
Jünger, Michael, Leipert, Sebastian and Mutzel, Petra 
ORCID: 0000-0001-7621-971X
(1997).
Pitfalls of using PQ-trees in Automatic Graph Drawing.
In:
Graph drawing : 5th international symposium, GD '97, Rome, Italy, September 18 - 20, 1997 ; proceedings,
pp. 193-204.
Springer.
Pasch, Helma
(1997).
The choice of linguae francae in triglossic environments.
In:
Language choices: conditions, constraints and consequences,
pp. 45-54.
Amsterdam and Philadelphia:
Benjamins.
ISBN 9027218315