LaMarche, Valmore K.K. Jr. & Hirschboeck, Katherine K. (1984). "Frost rings in trees as records of major volcanic eruptions". Nature. 307: 121–126. doi:10.1038/307121a0.CS1 maint: multiple names: authors list (link)
Baillie, M. G. L. & Munro, M. A. R. (1988). "Irish tree rings, Santorini and volcanic dust veils". Nature. 332: 344–346. doi:10.1038/332344a0.CS1 maint: multiple names: authors list (link)
Vogel, J. S.; dll. (1990). "Vesuvius/Avellino, one possible source of seventeenth century SM climatic disturbances". Nature. 344: 534–537. doi:10.1038/344534a0. Explicit use of et al. in: |author= (bantuan)
wikipedia.org
en.wikipedia.org
Vogel, J. S.; dll. (1990). "Vesuvius/Avellino, one possible source of seventeenth century SM climatic disturbances". Nature. 344: 534–537. doi:10.1038/344534a0. Explicit use of et al. in: |author= (bantuan)