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1998The norm estimate of the difference between the Kac operator and the Schrödinger semigroup: a unified approach to the nonrelativistic and relativistic cases
Takashi Ichinose, Satoshi Takanobu "The norm estimate of the difference between the Kac operator and the Schrödinger semigroup: a unified approach to the nonrelativistic and relativistic cases," Nagoya Mathematical Journal, Nagoya Math. J. 149(none), 53-81, (1998)