no. 2
Killing forms in a riemannian manifold with boundary
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 24 (1970) no. 2, pp. 349-356. 
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     author = {Tsagas, Grigorios},
     title = {Killing forms in a riemannian manifold with boundary},
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     pages = {349--356},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 24},
     number = {2},
     year = {1970},
     mrnumber = {268815},
     zbl = {0195.23601},
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Tsagas, Grigorios. Killing forms in a riemannian manifold with boundary. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 24 (1970) no. 2, pp. 349-356. http://archive.numdam.org/item/ASNSP_1970_3_24_2_349_0/

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