Cite
MLA Citation
M. Wertz et al.. “Hamburger Sternwarte plate archives: Historic long‐term variability study of active galaxies based on digitized photographic plates.” Astronomische Nachrichten, vol. 338, no. 1, 2017, pp. 103–110. http://access.bl.uk/ark:/81055/vdc_100044868398.0x000054