twistor
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I have already tried in arxiv but there are only 3 papers there. 
The discussion centers on locating the academic papers of Roger Penrose, exploring various resources and suggestions for accessing his works. The scope includes online databases, library resources, and specific publications.
Participants present multiple suggestions for finding Penrose's papers, but there is no consensus on a single best method or source.
Some suggestions depend on access to specific libraries or inter-library loan services, and the completeness of resources like arXiv and Google Scholar may vary.
George Jones said:See if you can find his coolected works
https://www.amazon.com/dp/B00A2KOFN6/?tag=pfamazon01-20
in your library, or through inter-library loan.