主题：【求助】（还剩1）求助4篇英文文献，谢谢大家帮忙！

【序号】： 1
【作者】： Norman EJ, Berry HK, Denton MD
【题名】： Identification and quantitation of urinary dicarboxylic acids as their dicyclohexyl esters in disease states by gas chromatography mass spectrometry
【期刊】： Biomed Mass Spectrom
【年、卷、期、起止页码】：1979;6:547–53
【序号】： 2
【作者】： Marcell PD, Stabler SP, Podell ER, Allen RH
【题名】： Quantitation of methylmalonic acid and other dicarboxylic acids in normal serum and urine using capillary gas chromatography-mass spectrometry
【期刊】： Anal Biochem
【年、卷、期、起止页码】：1985;150:58–66
【序号】： 3
【作者】： Straczek J, Felden F, Dousset B, Gueant JL, Belleville F
【题名】： Quantification of methylmalonic acid in serum measured by capillary gas chromatographymass spectrometry as tert.-butyldimethylsilyl derivatives
【期刊】： J Chromatogr
【年、卷、期、起止页码】：1993;620:1–7
【序号】： 4
【作者】： Young PB, Blanchflower WJ, Hewitt SA, Price J, Kennedy DG
【题名】： Sensitive gas chromatographic-high resolution mass spectrometric method for the determinationof methylmalonic acid in bovine plasma.
【期刊】： Analyst
【年、卷、期、起止页码】：1995;120:2199–201