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@article{GMJ_1994__1_2_47336, author = {Kreith, Kurt}, title = {A self-adjoint {\textquotedblleft}simultaneous crossing of the axis{\textquotedblright}.}, journal = {Georgian Mathematical Journal}, pages = {173--181}, publisher = {mathdoc}, volume = {1}, number = {2}, year = {1994}, zbl = {0830.35071}, language = {en}, url = {http://geodesic.mathdoc.fr/item/GMJ_1994__1_2_47336/} }
Kreith, Kurt. A self-adjoint “simultaneous crossing of the axis”.. Georgian Mathematical Journal, Tome 1 (1994) no. 2, pp. 173-181. http://geodesic.mathdoc.fr/item/GMJ_1994__1_2_47336/