@article {361180, title = {The origin of the problems in {E}uler{\textquoteright}s {A}lgebra}, journal = {Bulletin of the Belgian Mathematical Society - Simon Stevin}, volume = {13}, number = {5}, year = {2006}, pages = {949{\textendash}952}, issn = {1370-1444}, author = {Heeffer, Albrecht} }