Citations problems multiple authors

Kopfschmerzen

Hey,
I need a citation option where only one author is cited. It should already be quoted from two authors only one with et al. Does anyone have any suggestions?
for example:
B. Smith, G. Sneijder --> (Smith et al,...)

adamsmith

Here are a couple of options -- most of them have this in the citation, some in the bibliography. See what works:
begell-house-apa.csl:
begell-house-chicago-author-date.csl:
carcinogenesis.csl:
colorado-state-university-school-of-biomedical-engineering.csl:
harvard-european-archaeology.csl:
harvard-the-university-of-sheffield-school-of-east-asian-studies.csl:
infoclio-de-kurzbelege.csl:
international-pig-veterinary-society-congress-proceedings.csl:
journal-of-animal-physiology-and-animal-nutrition.csl:
kunstakademie-munster.csl:
les-journees-de-la-recherche-avicole.csl:
london-south-bank-university-numeric.csl:
method-and-theory-in-the-study-of-religion.csl: