Two theorems on “Polar coordinates and generalized h-type indices”
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论文评审过程：Received 31 March 2020, Revised 6 April 2020, Accepted 9 April 2020, Available online 30 May 2020, Version of Record 30 May 2020.
论文官网地址：https://doi.org/10.1016/j.joi.2020.101045
