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Preface
The authors would also like to thank the Springer team with Dr. Martin Peters,
Thanh-Ha Le Thi, and Leonie Kunz for the effective editorial and production
process.
This text was written in the DocOnce 1 [12] markup language.
Lysaker, Norway
Hans Petter Langtangen
December 2015
Porsgrunn, Norway
Svein Linge
June 2018
1 https://github.com/hplgit/doconce.