Voir la notice de l'article provenant de la source Hellenic Digital Mathematics Library
@article{EUA_1993-1994__9_a4, author = {Lynn Arthur Steen}, title = {\ensuremath{\Lambda}\ensuremath{\acute\upsilon}\ensuremath{\sigma}\ensuremath{\eta} \ensuremath{\tau}o\ensuremath{\upsilon} \ensuremath{\pi}\ensuremath{\rho}o\ensuremath{\beta}\ensuremath{\lambda}\ensuremath{\acute\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}o\ensuremath{\varsigma} \ensuremath{\tau}\ensuremath{\omega}\ensuremath{\nu} \ensuremath{\tau}\ensuremath{\varepsilon}\ensuremath{\sigma}\ensuremath{\sigma}\ensuremath{\acute\alpha}\ensuremath{\rho}\ensuremath{\omega}\ensuremath{\nu} \ensuremath{\chi}\ensuremath{\rho}\ensuremath{\omega}\ensuremath{\mu}\ensuremath{\acute\alpha}\ensuremath{\tau}\ensuremath{\omega}\ensuremath{\nu}}, journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} A }, pages = {108-115}, publisher = {mathdoc}, volume = {9}, year = {1993-1994}, language = {gr}, url = {http://geodesic.mathdoc.fr/item/EUA_1993-1994__9_a4/} }
Lynn Arthur Steen. Λύση του προβλήματος των τεσσάρων χρωμάτων. Ευκλείδης Α , Tome 9 (1993-1994), p. 108-115. http://geodesic.mathdoc.fr/item/EUA_1993-1994__9_a4/