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It is not the purpose of this correspondence to complain about that six outof seven theorems listed in Porcu and Schilling (arXiv:0812.2936; 2011,Bernoulli) belong to others, but not to the authors themselves. This is simplya call for the priority, originality, and correctness.

Priority and correctness on "From Schoenberg to Pick-Nevanlinna: Toward  a complete picture of the variogram class" by Porcu and Schilling (2011,  arXiv:0812.2936)