Periodicity in the continua and broad line curves of a quasar E1821+643
Crossref DOI link: https://doi.org/10.1007/s10509-017-3009-z
Published Online: 2017-01-19
Published Print: 2017-02
Update policy: https://doi.org/10.1007/springer_crossmark_policy
Kovačević, A. http://orcid.org/0000-0001-5139-1978
Popović, L. Č.
Shapovalova, A. I.
Ilić, D.
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