no. 1
Jumping nonlinearities for fourth order B.V.P.
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 2 (1993) no. 1, pp. 53-72. 
@article{AFST_1993_6_2_1_53_0,
     author = {Garc{\'\i}a-Huidobro, Marta and Man\'asevich, Ra\'ul},
     title = {Jumping nonlinearities for fourth order {B.V.P.}},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {53--72},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 2},
     number = {1},
     year = {1993},
     mrnumber = {1230705},
     zbl = {0773.34016},
     language = {en},
     url = {http://www.numdam.org/item/AFST_1993_6_2_1_53_0/}
}
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García-Huidobro, Marta; Manásevich, Raúl. Jumping nonlinearities for fourth order B.V.P.. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 2 (1993) no. 1, pp. 53-72. http://www.numdam.org/item/AFST_1993_6_2_1_53_0/

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