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@article{10_4064_fm_115_1_43_55, author = {Jouko V\"a\"an\"anen}, title = {\ensuremath{\Delta}-extension and {Hanf-numbers}}, journal = {Fundamenta Mathematicae}, pages = {43--55}, publisher = {mathdoc}, volume = {115}, number = {1}, year = {1983}, doi = {10.4064/fm-115-1-43-55}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-115-1-43-55/} }
Jouko Väänänen. Δ-extension and Hanf-numbers. Fundamenta Mathematicae, Tome 115 (1983) no. 1, pp. 43-55. doi : 10.4064/fm-115-1-43-55. http://geodesic.mathdoc.fr/articles/10.4064/fm-115-1-43-55/
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