I. Androulidakis
Crossed modules and the integrability of transitive Lie algebroids (preprint)
Submitted to Ann. Inst. Fourier PDF
I. Androulidakis
On the connection theory of extensions of transitive Lie groupoids
To appear in J. Diff. Geom. & Appl. PDF
I. Androulidakis
Classification of extensions of principal bundles and transitive Lie groupoids with prescribed kernel and cokernel
J. Math. Phys., 45(10):3095-4012, 2004. PDF
I. Androulidakis
Connections on Lie algebroids and the Weil-Kostant theorem
Bull. Hellenic Math. Soc. 44:51-57, 2000 PDF