- http://experiment.worldcat.org/entity/work/data/287694091#Topic/categories_mathematiques
- http://id.loc.gov/authorities/subjects/sh85136089
- http://experiment.worldcat.org/entity/work/data/287694091#Topic/topologie
- http://id.loc.gov/authorities/subjects/sh85022622
- http://id.worldcat.org/fast/852291
- http://id.worldcat.org/fast/1152692

- http://experiment.worldcat.org/entity/work/data/287694091#Organization/nordic_summer_school_in_mathematics
- http://id.loc.gov/authorities/names/n50072180
- http://experiment.worldcat.org/entity/work/data/287694091#Meeting/nordic_summer_school_in_mathematics_aarhus_denmark_1968
- http://experiment.worldcat.org/entity/work/data/287694091#Organization/nordic_summer_school_in_mathematics_aarhus_denmark_1968
- http://worldcat.org/entity/person/id/2687706344
- http://viaf.org/viaf/153578632

- "On characteristic classes : lectures given at the Nordic Summer School in Mathematics, June 16th - July 6th 1968"
- "On characteristic classes : lectures given at the Nordic Summer School in mathematics, June 16th-July 6th 1968"
- "On characteristic classes. Lectures given at the Nordic Summer School in Mathematics, June 16th-July 6th 1968"@en
- "On characteristic classes. Lectures given at the Nordic Summer School in Mathematics, June 16th-July 6th 1968"
- "On characteristic classes : Lectures given at the Nordic Summer School in mathematics. June 16th-July 6th 1968"
- "On characteristic classes : Chapter I-VI : Lectures given at the Nordic Summer School in Mathematics : June 16th - July 6th 1968"
- "On characteristic classes : chapter 1-6 : lectures given at the Nordic Summer School in Mathematics : June 16.-July 6. 1968"
- "On characteristic classes : Lectures given at the Nordic Summer School in mathematics June 16th - July 6th 1968"@da

- http://www.worldcat.org/oclc/310798171
- http://www.worldcat.org/oclc/488673378
- http://www.worldcat.org/oclc/94257
- http://www.worldcat.org/oclc/462809672
- http://www.worldcat.org/oclc/819949155
- http://www.worldcat.org/oclc/715368435
- http://www.worldcat.org/oclc/258345880
- http://www.worldcat.org/oclc/869645183
- http://www.worldcat.org/oclc/488355365