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+@article{Epstein1965,
+  author       = {Epstein, H. and Glaser, V. and Jaffe, A.},
+  title        = {Nonpositivity of the Energy Density in Quantized Field Theories},
+  publisher    = {Società Italiana di Fisica},
+  journaltitle = {Il Nuovo Cimento},
+  volume       = {36},
+  issue        = {3},
+  date         = {1965},
+  pages        = {1016--1022},
+  issn         = {1827-6121},
+  doi          = {10.1007/BF02749799},
+  language     = {english},
+}