605,927 LITZEN ANNE Asymmetrical flow field-flow fractionation : [doctoral thesis] / by Anne Litzen. - Uppsala : Academiae Ubsaliensis, 1992. - 45,s. : wykr. ; 23 cm (Acta Universitatis Upsaliensis : Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 0282-7484 ; 93) ISBN 91-554-2898-3