au.\*:("VAN DEN ENK JE")
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A SYSTEM FOR ROUTINE ANALYSIS OF CHLORINE, SULPHUR, POTASSIUM AND CALCIUM IN BRINE BY X-RAY FLUORESCENCE SPECTROMETRY APPLYING THEORETICAL MATRIX CORRECTIONSVAN DEN ENK JE; JANSSEN JJ; DE JONGH WK et al.1976; X-RAY SPECTROM.; G.B.; DA. 1976; VOL. 5; NO 2; PP. 68-72; BIBL. 7 REF.Article
DETERMINATION OF TOTAL MERCURY IN WORKROOM AIR BY ATOMIC ABSORPTION OR X-RAY FLUORESCENCE SPECTROMETRY AFTER COLLECTION ON CARBON-LOADED PAPER.JANSSEN JH; VAN DEN ENK JE; BULT R et al.1976; ANAL. CHIM. ACTA; PAYS-BAS; DA. 1976; VOL. 84; NO 2; PP. 319-326; BIBL. 15 REF.Article
DETERMINATION OF TOTAL MERCURY IN AIR BY ATOMIC ABSORPTION SPECTROMETRY AFTER COLLECTION ON MANGANESE DIOXIDE.JANSSEN JH; VAN DEN ENK JE; BULT R et al.1977; ANAL. CHIM. ACTA; PAYS-BAS; DA. 1977; VOL. 92; NO 1; PP. 71-77; BIBL. 7 REF.Article