8552/2009/EC, Registration, evaluation, authorisation and restriction of chemicals (REACH) as regards annex X VII [ S]. Official Journal of the European Union, 2009, L164 : 7 -31.
9Rooker S J, Vaughn N P, Le Guen J M. On the visibility of fibers by phase contrast microscopy [ J ]. American hutustrial Hygiene Association Journal, 1982,43 : 505 - 515.
