This appears to be a paper written for satisfying a CS Master's degree requirement. If you are looking for a survey on this topic, this is probably a better starting point: https://arxiv.org/abs/1504.00616

The authors website says they are studying for a PhD. Could it be their PhD thesis? http://www.cs.umd.edu/~amitc/publications.html

That program has a requirement for writing a "scholarly paper" described here: http://www.cs.umd.edu/grad/policy-manual#7.2.MS-nonthesis-re...

This was most likely done to satisfy that requirement to earn a MS "along the way" to a PhD.

11 pages is way too short for a PhD thesis. And on the bottom of the first page, it says:

"Submitted for the fulfillment of requirement of a Scholarly Paper for Master of Science without thesis option."

When was this written?

I personally hate non-dated preprints or technical reports. Only way to guess is to use max(date(ppaper) for paper in references), which may or may not be close the the actual date of writing.

Creation-Date of the PDF is 2 Dec 2015, 17:18