Manu Basavaraju, Fahad Panolan, Ashutosh Rai, M. S. Ramanujan, Saket Saurabh. On the Kernelization Complexity of String Problems. Computing and Combinatorics - 20th International Conference, COCOON 2014, Atlanta, GA, USA, August 4-6, 2014. Proceedings, pages 141-153, 2014.