To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:HPSL_Reg, year=2008, title={VO {HPSL} datacenter Registry}, author={Lukasz Tomasik}, url={http://vespa.cbk.waw.pl/__system__/services/registry/info}, howpublished={{VO} resource provided by the VO {HPSL} datacenter} }