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Wikipedia: de.wikipedia.or ... https://de.wikipedia.org/wiki/Optics_Communications
Wikipedia: en.wikipedia.or ... https://en.wikipedia.org/wiki/Optics_Communications
SUDOC: www.sudoc.fr/03 ... http://www.sudoc.fr/038766124
Wikidata: www.wikidata.or ... http://www.wikidata.org/entity/Q7098916
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Google: www.google.com/ ... https://www.google.com/search?q=ISSN+%220030-4018%22
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Koninklijke Bibliotheek: opc4.kb.nl/DB=1 ... http://opc4.kb.nl/DB=1/LNG=EN/CMD?ACT=SRCHA&IKT=8&TRM=0030-4018
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Pubmed: pubmed.ncbi.nlm ... https://pubmed.ncbi.nlm.nih.gov/?term=%220030-4018%22%5BJournal%5D&sort=
