URL: www.sciencedire ... http://www.sciencedirect.com/science/journal/01616420
Wikipedia: en.wikipedia.or ... https://en.wikipedia.org/wiki/Ophthalmology_(journal)
Wikipedia: pl.wikipedia.or ... https://pl.wikipedia.org/wiki/Ophthalmology
SUDOC: www.sudoc.fr/03 ... http://www.sudoc.fr/03702244X
Wikidata: www.wikidata.or ... http://www.wikidata.org/entity/Q7098109
FATCAT: fatcat.wiki/con ... https://fatcat.wiki/container/huzqbmgsqzcy7jjzbdrxcbbxgy
URL: www.sciencedire ... http://www.sciencedirect.com/science/journal/01616420
Wikipedia: en.wikipedia.or ... https://en.wikipedia.org/wiki/Ophthalmology_(journal)
Wikipedia: pl.wikipedia.or ... https://pl.wikipedia.org/wiki/Ophthalmology
SUDOC: www.sudoc.fr/03 ... http://www.sudoc.fr/03702244X
Wikidata: www.wikidata.or ... http://www.wikidata.org/entity/Q7098109
FATCAT: fatcat.wiki/con ... https://fatcat.wiki/container/huzqbmgsqzcy7jjzbdrxcbbxgy
Google: www.google.com/ ... https://www.google.com/search?q=ISSN+%220161-6420%22
Bing: www.bing.com/se ... https://www.bing.com/search?q=ISSN+%220161-6420%22
Yahoo: search.yahoo.co ... https://search.yahoo.com/search?p=ISSN%20%220161-6420%22
Koninklijke Bibliotheek: opc4.kb.nl/DB=1 ... http://opc4.kb.nl/DB=1/LNG=EN/CMD?ACT=SRCHA&IKT=8&TRM=0161-6420
CROSSREF: search.crossref ... https://search.crossref.org/?q=+0161-6420
Pubmed: pubmed.ncbi.nlm ... https://pubmed.ncbi.nlm.nih.gov/?term=%220161-6420%22%5BJournal%5D&sort=