Last names in citations

Last names in citations

[Fulvio Satta]

Hi, probably my question is not a very hard one but I don't find a way
to do what I'm trying to do.

If I use \cite[authoryears] ConTeXt uses last names in the citation.
That's what I want, but I want to use another style for my task, that
I defined this way:

\definebtx[aps:cite:margin][authorconversion=normalshort]
\startsetups btx:aps:cite:margin
  \texdefinition{btx:aps:title}
  \texdefinition{btx:aps:author}
  \doiftextelse\currentbtxrighttext{
    \currentbtxrighttext
  } {
    \removeunwantedspaces
    \removepunctuation
  }

this works and is perfect for my style, but I obtain the full names,
and not just the last names. How can I obtain something similar to the
citation I'm using, but with just last names?
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