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H. de Snoo, H. Woracek:
"Sums, couplings, and completions of almost Pontryagin spaces";
in: "ASC Report 03/2011", issued by: Institute for Analysis and Scientific Computing; Vienna University of Technology, Wien, 2011, ISBN: 978-3-902627-04-9.

An almost Pontryagin space can be written as the direct and orthogo-
nal sum of a Hilbert space, a finite-dimensional anti-Hilbert space, and a
finite-dimensional neutral space. In this paper various constructions with
such spaces are considered. In particular, orthogonal sums of almost Pon-
tryagin spaces and completions to almost Pontryagin spaces are treated
in detail.

almost Pontryagin space, degenerate space, orthogonal coupling,

http://www.asc.tuwien.ac.at/preprint/2011/asc03x2011.pdf