Jakob Nielsen : collected mathematical papers.
APA Citation
Nielsen, J., Hansen, V. Lundsgaard., Dansk matematisk forening. (1986). Jakob Nielsen : collected mathematical papers. Boston: Birkhaüser.
MLA Citation
Nielsen, Jakob, 1890-1959, Vagn Lundsgaard Hansen, and Dansk matematisk forening. Jakob Nielsen : Collected Mathematical Papers. Boston: Birkhaüser, 1986.
Warning: These citations may not always be complete (especially for serials).