hal-00795529 title_s Junction of One-Dimensional Minimization Problems involving S^2 Valued Maps auteur Antonio Gaudiello, Rejeb Hadiji journal Adv.Diff.Equations volume 13 pages p. 935-958 fichier_hal https://hal.archives-ouvertes.fr/hal-00795529/document annee 2008 Identifiant HAL 719021 822417