@article {Abreu:1996pa,
	title = {{Search for neutral heavy leptons produced in Z decays}},
	journal = {Z. Phys.},
	volume = {C74},
	year = {1997},
	note = {[Erratum: Z. Phys.C75,580(1997)]},
	pages = {57-71},
	doi = {10.1007/s002880050370},
	author = {Abreu, P. and others}
}
