The phrase 'concerns the source' is correct and usable in written English.
You can use it to indicate the topic that is being discussed, particularly if it is connected to a particular source. For example, "This article concerns the source of the longest river in Europe".
Another concerns the source of an agent's actions.
In this context, a major challenge concerns the source, identification and isolation of stem cells potentially useful for transplantation or reconstitution approaches.
The first evident problem concerns the source of the very large number of chemical structures which are necessary to generate the wide variety of [the first block of] InChIKeys.
"There are concerns," the source had said, expressing a lack of optimism that the two would reach a consensus.
The third question concerns the source of transmissibility and antigenic shift of influenza A, which could be an important issue facing the next influenza outbreak.
The trickiest part of the model for pAgos in phage defense concerns the source of guide DNA or RNA.
The case concerns the sourcing for a chapter in Mr. Risen's 2006 book, "State of War," which recounted an effort by the C.I.A. in the Clinton administration to sabotage Iranian nuclear research.
"Some are slightly concerned," the source said.
There is cause for concern," the source said this week.
Although scientists have long had an inclination to shrug aside such questions concerning the source of the laws of physics, the mood has now shifted considerably.
"Nigel was an excellent journalist and although he often wrote stories which were critical of the bodies represented by those who signed they still respected him and his departure was a cause of concern," the source said of the letter.
