How to structure scientific references into groups using R?

Question

Lets imagine the following two references:

ref1 <- "Smith, A. L., Reganold, J. P., Jones, M. S., Orpet, R. J., Taylor, J. M., Thurman, J. H., Cornell, K. A., Olsson, R. L., Ge, Y., Kennedy, C. M., & Crowder, D. W. (2020). Landscape context affects the sustainability of organic farming systems. Proceedings of the National Academy of Sciences, 117(6), 2870–2878. https://doi.org/10.1073/pnas.1906909117"

ref2 <- "Muller, A., Schader, C., El-Hage Scialabba, N. et al. Strategies for feeding the world more sustainably with organic agriculture. Nat Commun 8, 1290 (2017). doi.org/10.1038/s41467-017-01410-w"

And I would like to group this data into (for example)

data.frame(first_author = c("Smith, A. L.","Reganold, J. P."), 
          second_author = c("Muller, A.","Schader, C."),
          year = c("2020","2017"),
          title = c("Landscape context affects the sustainability of organic farming systems","Strategies for feeding the world more sustainably with organic agriculture"), 
          journal = c("Proceedings of the National Academy of Sciences","Nat Commun"),
          volume.issue = c("117(6)","8(1290)"),
          pages = c("2870–2878",NA),
          doi = c("https://doi.org/10.1073/pnas.1906909117","doi.org/10.1038/s41467-017-01410-w"))