Sterospecificity of hydrolytic enzymes in their reaction... ; uitg. R.V.O./T.N.O. Chemisch Laboratorium / H.L. Boter ; A.J.J. Ooms Inhomogeneity of oxygen samplers in the cosmodyne CS-4.4 Sampler / H. van Someren and H.C. Beck ; uitg. R.V.O./T.N.O. Chemisch Laboratorium