Binary VLE data Piperazine - H2O

Hey,

For my PhD-project I need binary VLE data on the system Piperazine (C4H10N2)
with water at temperatures between 273 and 373 K, but so far I have not been
able to find anything useful. I went through most conventional sources
without any luck.

Anybody have any idea where-else to look? Papers, books? Any possible (open
literature) source is welcome.

Tnx & Grtz,

Peter

PS I have not mentioned the sources I checked so far in order to get a list
of possible sources, which is as extensive as possible.

[sfakor]

i need it too, for my project.
if you had found it,please sent it for me