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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     title = {Killing forms in a riemannian manifold with boundary},
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     pages = {349--356},
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     volume = {Ser. 3, 24},
     number = {2},
     year = {1970},
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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://www.numdam.org/item/ASNSP_1970_3_24_2_349_0/

[1] S. Chern, Lecture note on differential geometry I. Chicago, 1955.

[2] G.F.D. Duff, Differential forms in manifolds with boundary, Ann. of Math. 56 (1952), pp. 115-127. | MR | Zbl

[3] G.F.D. Duff and D.C. Spencer, Harmonic tensors on Riemannian manifolds whith boundary, Ann. of Math. 56 (1952), pp. 128-156. | MR | Zbl

[4] A. Lichnerowicz, Théorie Globale des Connexions et des Groupes D'Holonomie, Ed. Cremonese, Rome, 1955. | Zbl

[5] A. Lichnorowicz, Geometrie des Groupes de Transformation, Dunod Paris, 1958. | Zbl

[6] G. Tsagas, A relation between Killing tensor fields and negative pinched Riemannian manifolds, Proc. Amer. Math. Soc. 22 (1969), pp. 476-478. | Zbl

[7] G. Tsagas, An improvement of the method of Yano on the Killing tensor fields and ourvature of a compact manifold, to appear in the Tensor. | Zbl

[8] K. Yano and S. Bochner, Curvature and Betti numbera, Ann. of Math. Studies, NO 32, Princ. Univ. Press, 1953. | Zbl

[9] K. Yano, Harmonics and Killing vector fields in Riemannian spaces with boundary. Ann. of Math. 69 (1959), pp. 588-597. | Zbl

[10] K. Yano, Harmonic and Killing tensor fields in Riemannian spaces with boundary, Journ. of the Math. Soc. Jap., 19 (1958), pp. 430-437. | Zbl