related work: wording

related-work.tex

@@ -30,7 +30,7 @@ One of his supervisors wrote her Ph.D. thesis about solving the MSRCPSP \cite{Mo
 
 \citet{Artigues2008} has written a book about the resource-constrained scheduling problem, which contains a chapter about the multi-skill variant.
 
-To the best of our knowledge, \citet{CorreiaLS2012} are the first ones to study solving the multi-skill variant of the RCPSP.
+\citet{CorreiaLS2012} were among the first ones to study solving the multi-skill variant of the RCPSP.
 In this publication, they call it RCPSP with flexible resources.
 \citet{AlmeidaCS2016} present a parallel scheduling heuristic to solve the MSRCPSP, and conduct computer experiments to validate their approach.
 Recently they used a genetic algorithm to solve the MSRCPSP \cite{AlmeidaCS2018}.