There's only two authors! That's so rude!
It’s also not correct; et al. is conventionally applied to three or more authors (it means “and others,” plural)
Why? For all the automatic academic score tracking systems it doesn't matter one bit if it is Wulf et al. or Wulf and McKee.
It’s also not correct; et al. is conventionally applied to three or more authors (it means “and others,” plural)