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added pointer to * [[Matthias Blau]], _Plane waves and Penrose limits_ ([pdf](http://www.blau.itp.unibe.ch/lecturesPP.pdf)) <a href="https://ncatlab.org/nlab/revision/diff/pp-wave+spacetime/4">diff</a>, <a href="https://ncatlab.org/nlab/revision/pp-wave+spacetime/4">v4</a>, <a href="https://ncatlab.org/nlab/show/pp-wave+spacetime">current</a>
added pointer to
diff, v4, current