Geodesic
A Quartic Conformally Covariant Differential Operator for Arbitrary Pseudo-Riemannian Manifolds (Summary)
Symmetry, integrability and geometry: methods and applications, Tome 4 (2008) Cet article a éte moissonné depuis la source Math-Net.Ru

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This is the original manuscript dated March $9^\mathrm{th}$ 1983, typeset by the Editors for the Proceedings of the Midwest Geometry Conference 2007 held in memory of Thomas Branson. Stephen Paneitz passed away on September $1^\mathrm{st}$ 1983 while attending a conference in Clausthal and the manuscript was never published. For more than 20 years these few pages were circulated informally. In November 2004, as a service to the mathematical community, Tom Branson added a scan of the manuscript to his website. Here we make it available more formally. It is surely one of the most cited unpublished articles. The differential operator defined in this article plays a key rôle in conformal differential geometry in dimension 4 and is now known as the Paneitz operator.
Keywords: Paneitz operator; conformal covariance. 
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     author = {Stephen M. Paneitz},
     title = {A~Quartic {Conformally} {Covariant} {Differential} {Operator} for {Arbitrary} {Pseudo-Riemannian} {Manifolds} {(Summary)}},
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     url = {http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a35/}
}
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Stephen M. Paneitz. A Quartic Conformally Covariant Differential Operator for Arbitrary Pseudo-Riemannian Manifolds (Summary). Symmetry, integrability and geometry: methods and applications, Tome 4 (2008). http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a35/