Geodesic
Cosine families of unbounded normal operators
Annales Polonici Mathematici, Tome 50 (1989) no. 2, pp. 191-208

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Jan Niechwiej. Cosine families of unbounded normal operators. Annales Polonici Mathematici, Tome 50 (1989) no. 2, pp. 191-208. doi: 10.4064/ap-50-2-191-208
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     title = {Cosine families of unbounded normal operators},
     journal = {Annales Polonici Mathematici},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-50-2-191-208/}
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