The following publications are possibly variants of this publication: 
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 - Fully discrete spectral methods for solving time fractional nonlinear Sine-Gordon equation with smooth and non-smooth solutionsZeting Liu, Shujuan Lü, Fawang Liu. amc, 333:213-224, 2018.  [doi] 
 - Galerkin spectral method for nonlinear time fractional Cable equation with smooth and nonsmooth solutionsHaiyu Liu, Shujuan Lü. amc, 350:32-47, 2019.  [doi] 
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