Geodesic
Cosine Functions of Unbounded Operators and Second Order Differential Equations
Mathematica balkanica, Tome 4 (1990) no. 3-4, p. 329.

Voir la notice de l'article provenant de la source Mathematicac Balkanica website

@article{MABA_1990_4_3-4_a10,
     author = {Jan Niechwiej},
     title = {Cosine {Functions} of {Unbounded} {Operators} and {Second} {Order} {Differential} {Equations}},
     journal = {Mathematica balkanica},
     pages = {329},
     publisher = {mathdoc},
     volume = {4},
     number = {3-4},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/MABA_1990_4_3-4_a10/}
}
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Jan Niechwiej. Cosine Functions of Unbounded Operators and Second Order Differential Equations. Mathematica balkanica, Tome 4 (1990) no. 3-4, p. 329. http://geodesic.mathdoc.fr/item/MABA_1990_4_3-4_a10/