Tremolo beams between more than two notes

[Martin Kretzschmar]

Hi,

I'm trying to print tremolo marks over four whole notes as in this
example http://imslp.org/wiki/Special:ImagefromIndex/54475 (page 2)
but couldn't find out how to do it in lilypond (2.12.3).

In other words, is there a way to modify this:

\relative c' { \time 4/1 \repeat tremolo 8 { e16 g } \repeat tremolo 8 { b g } }

to connect the beams? Or maybe sneak in the two extra notes in place
of the skips into this (apparently illegal code)

\relative c' { \time 4/1 \repeat tremolo 16 { e16 s s g } }

?

Thanks,
Martin