Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1961__16_140722, author = {E. Trost}, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {13--13}, publisher = {mathdoc}, volume = {16}, year = {1961}, url = {http://geodesic.mathdoc.fr/item/ELMA_1961__16_140722/} }
E. Trost. Ungelöste Probleme.. Elemente der Mathematik, Tome 16 (1961), p. 13. http://geodesic.mathdoc.fr/item/ELMA_1961__16_140722/