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The paper studies the Schwarzschild metric as written in Kruskal co-ordinates and investigates the properties of a Schwarzschild black hole in these co-ordinates.
There doesn't seem to be anything original here. Studying the Schwarzschild metric in Kruskal co-ordinates is nothing new, and skimming through the paper, all mentioned results (e.g. proper time interval at event horizon, Lorentz contraction of region beyond event horizon, etc.) are rather trivial once the metric is defined, besides being well-known.
On a sidenote, the paper uses somewhat unconventional terminology, e.g. "infinite density of the time coordinate spacing" to refer to zero proper time interval.
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