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When I ran it on my advisor's name, it gave the actual titles of two of his papers. Entertaining, though.

It seems to be a common pattern. When I ran it with the argument "A Einstein", I got "On the electrodynamics of moving bodies." as one of the results.

Edit: Also, for "P Erdos", I got "On a new law of large numbers."

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From the article:

If you’re using a small corpus and long Markov chains, you’ll end up with lots of actual strings from the corpus, and no fake ones. If this happens, experiment with the second parameter to the constructor for the class “MarkovGenerator.”

For the authors you are using, the corpus is too small.

Since Paul Erdos is one of the most prolific mathematicians ever, the problem is more likely that the default chain length (4) is too long for even a relatively large corpus. A chain length of 2 does much better.

Maybe you could keep actual paper names in a separate array, and check generated results against them before returning..

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