Antiparticle in Light of Einstein-Podolsky-Rosen Paradox and Klein   Paradox
  The original version of Einstein-Podolsky-Rosen (EPR) paradox and the Klein paradox of Klein-Gordon (KG) equation are discussed to show the necessity of existence of antiparticle with its wavefunction being fixed unambiguously. No concept of "hole" is needed. 
Guang-jiong Ni, Hong Guan, Weimin Zhou and Jun Yan