**DIPS 8/2004**[tex source, PostScript, PDF file, dvi]-
**Title:**Ricci flat 4-metrics with bidimensional null orbits.

Part II. The Abelian case.**Authors:**D. Catalano Ferraioli and A. M. VinogradovRicci flat pseudo-Riemannian 4-metrics possessing an Abelian Killing algebra with bidimesnional null orbits are studied under the assumption that the distribution orthogonal to the orbits is completely integrable. The results of this paper toghether with those of part I (see DIPS-7/2004) give a full description of Ricci flat metrics with bidimensional null Killing orbits whose distribution orthogonal to the orbits is completely integrable.

15 pages, AmS-LaTeX (LaTeX-2e).

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