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References
- ↑ Ellonen, Leena, ed. (2008). Suomen professorit 1640–2007 Finlands professorer (in Finnish and Swedish). Helsinki: Professoriliitto. p. 753. ISBN 978-952-99281-1-8.
- ↑ "Tukia, Pekka". University of Helsinki.
- ↑ Pekka Tukia at the Mathematics Genealogy Project
- ↑ Préaux, Jean-Philippe (2012). "A survey on Seifert fibre space conjecture". arXiv: 1202.4142 [math.AT].
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