ULTRATRACE ELEMENT CONTENTS IN RAT TISSUES: COMPARATIVE ANALYSIS OF SERUM AND HAIR AS INDICATIVE MATRICES OF THE TOTAL BODY BURDEN Article Skalny A.V., Tinkov A.A., Skalny A.A., Medvedeva Yu.S., Alchinova I.B., Ajsuvakova O.P., Karganov M.Yu., Nikonorov A.A. Archives of Biological Sciences. Vol. Vol68. 2016. P. 623-632