sentence: Mizuguchi, M., Kubo, T., Takayasu, A., & Oishi, S. (2013) A priori error estimate of inhomogeneous heat equations using rational approximation of semigroups.
modified: fix grammar: Mizuguchi, M., Kubo, T., Takayasu, A., & Oishi, S. (2013) An priori error estimate of inhomogeneous heat equations using rational approximation of semigroups.