Geodesic
On naturality of the Helmholtz operator
Archivum mathematicum, Tome 41 (2005) no. 2, pp. 145-149.

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We deduce that all natural operators of the type of the Helmholtz map from the variational calculus in fibered manifolds are the constant multiples of the Helmholtz operator.
Classification : 58A20, 58A32
Keywords: natural operator; Euler morphism; Helmholtz operator 
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     title = {On naturality of the {Helmholtz} operator},
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Mikulski, W. M. On naturality of the Helmholtz operator. Archivum mathematicum, Tome 41 (2005) no. 2, pp. 145-149. http://geodesic.mathdoc.fr/item/ARM_2005__41_2_a1/