Also, more sophisticated approaches for modelling the time series data such as using Fourier transforms or Recurrent Neural Networks can be investigated in context of modelling the growth of scientific topics in this domain.
we do not have enough temporal data points for LREC (2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014) to experiment with such approaches.