74 In 1984, Jones et al. made several amino acid esters of X and evaluated them as …. Reference to single investigations in the past: investigation prominent Preliminary work on X was undertaken by Abdul Karim (1992). The first systematic study of X was reported by Patel et al. in 1986. The study of the structural behaviour of X was first carried out by Rao et al. (1986)….. Analysis of the genes involved in X was first carried out by Smith et al (1983). One study by Smith (2014) examined the trend in …. A recent study by Smith and Jones (2012) involved …. A longitudinal study of X by Smith (2012) reports that …. A small scale study by Smith (2012) reaches different conclusions, finding no increase in …. Smith’s cross-country analysis (2012) showed that …. Smith’s comparative study (2012) found that …. Detailed examination of X by Smith and Patel (1961) showed that …. Brown’s (1992) model of X assumes three main …. In an analysis of X, Smith et al. (2012) found …. In an investigation into X, Smith et al. (2012) found ….
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