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We use an example model to illustrate the occurrence of superluminal propagation for field values approaching the singularity.<\/jats:p>","DOI":"10.1088\/1402-4896\/ab842d","type":"journal-article","created":{"date-parts":[[2020,3,27]],"date-time":"2020-03-27T18:30:31Z","timestamp":1585333831000},"page":"065218","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Degenerate behavior in nonlinear vacuum electrodynamics"],"prefix":"10.1088","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1812-4779","authenticated-orcid":false,"given":"C A","family":"Escobar","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6915-3994","authenticated-orcid":false,"given":"R","family":"Potting","sequence":"additional","affiliation":[]}],"member":"266","published-online":{"date-parts":[[2020,4,9]]},"reference":[{"key":"psab842dbib1","doi-asserted-by":"publisher","first-page":"425","DOI":"10.1098\/rspa.1934.0059","type":"journal-article","volume":"144","author":"Born","year":"1934","journal-title":"Proc. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2020-01-16","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2020-03-27","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2020-04-09","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}