@article {44775, title = {Helge Backlund in memoriam}, journal = {Bulletin of the Geological Institutions of the University of Uppsala}, volume = {38}, year = {1960}, pages = {I{\textendash}XIX}, url = {https://paleoarchive.com/literature/Ahman1960-HelgeBacklundInMemoriam.pdf}, author = {Erik {\r A}hman} }