The article used many letters written between people, which was an interesting thing see, as that was a good source of information for the fires back many years ago. In using a variety of disasters over many years to write the article, the author had to use different types of sources as society and technology developed.
Many of the citations are from the MSF compilation, but others are clearly other studies or research articles. They are all from the past 20 years or so, since humanitarian and womens' sexual rights gained popularity and momentum around that time.
They researched a lot into tuberculosis/HIV and the social issues that were discussed. Articles on asthma were also reviewed and used, despite asthma not being directly discussed, as well as lead poisoning. This could indicate that more diseases are affected by social issues than discussed in the article, or maybe those diseases didn't show any correlation.
The article was compiled from a lot of personal stories, paired with research about culture, medicine, and beliefs.
The references list for this article shows a wide variety of resources that were used to write the paper. They vary in topics, some directly looking at nuclear energy, others at the risks society takes, regulations, and organizational structures.
The pdf did not include the bibliography, however I would assume that a lot of the scientific information came from other, more medical/chemical rather than sociological, Chernobyl research.
The bibliography shows that many of the resources were papers on mental health issues like PTSD, as well as mental health after specific disasters. From this information, the authors were likely able to find comparisions between mental health trends after disasters, and then how those compare to PTSD trends.
No bibliography was given, but the citations that are used in the article are likely from medical records or government records of some sort.