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Pair Production in a Field of Heavy Nuclei and in a Gravitational Fielda All-Russian Scientific Research Institute of Experimental Physics — Federal Nuclear Centre, prosp. Mira 37, Sarov, Nizhny Novgorod region, 607190, Russian Federation b Kapitza Institute of Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russian Federation c Dipartimento di Fisica, Università di Trento and BDC Center, Povo, Trento, I-38050, Italy d Research Institute for Complex Testing of Optoelectronic Devices and Systems, Sosnovyi Bor, Leningrad region, Russian Federation
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