It’s also not correct; et al. is conventionally applied to three or more authors (it means “and others,” plural)
"et alia" usually means "and others", but technically in Latin "alia" can be either plural neuter or singular female!
No, plural can’t be deduced from how it is written.
"et alia" usually means "and others", but technically in Latin "alia" can be either plural neuter or singular female!