I want to know the answer to the following question:
Who wrote "Russian language at the turn of the 20th-21st centuries"?
All the background I'm provided with is that "In 2012, A. L. Arefyev published a new study "Russian language at the turn of the 20th-21st centuries", in which he confirmed his conclusion about the trend of further weakening of the Russian language in all regions of the world (findings published in 2013 in the journal "Demoskop Weekly").". Is that enough to answer the question?
Answer: yes