14 | P a g e
Recent evidence suggests that …. (Smith, 1996; Jones 1999; Johnson, 2001)
Recently, in vitro studies have shown that X can …. (Patel et al., 1997; Jones et al., 1998).
Several studies investigating X have been carried out on ….
Several attempts have been made to …. (Smith, 1996; Jones 1999; ….).
Several studies thus far have linked X with Y (Smith, 2002; Jones 2004; ….).
Several studies have revealed that it is not just X that acts on ….. (Smith, 1996; Jones ….
Several biographies of Brown have been published. Smith (2013) presents …..
The geology of X has been addressed in several small-scale investigations and ….
Data from several sources have identified the increased X and Y associated with obesity.
Previous studies have reported …. (Smith, 1985; Jones, 1987; Johnson, 1992).
Previous research has indicated that various X indicators have a positive impact on ….
Previous research findings into X have been inconsistent and contradictory (Smith, 1996; ….)
Numerous studies have attempted to explain …. (for example, Smith , 1996; Kelly, 1998; ….)
A number of authors have reported analyses of trends in X that demonstrated ….
A number of studies have found that …. (Smith , 2003; Jones, 2004).
A number of studies have examined X (e.g. Smith, 2003; Jones, 2005), but to date none has ….
Xs have been identified as major contributing factors for the decline of many species (1).
X has also been shown to reverse the anti-inflammatory effects of Y in murine-induced arthritis.
Twenty cohort study analyses have examined the relationship between ….
At least 152 case-control studies worldwide have examined the relationship between…..
Other studies have considered the relationship ….
The relationship between X and Y has been widely investigated (Smith, 1985; Jones, 1987, ….
The causes of X have been widely investigated (Jones, 1987; Johnson, 1990; Smith, 1994).
Factors thought to be influencing X have been explored in several studies.
It has been suggested that levels of X are independent of the size of the Y (Smith et al., 1995).
It has conclusively been shown that X and Y increase Z (Smith et al., 1999; Jones, 2001 ….).
It has been demonstrated that a high intake of X results in damage to …. (Smith, 1998; ….).
Reference to current state of knowledge
There is an unambiguous relationship between X and Y (Rao, 1998).
X is one of the most intense reactions following CHD (Lane, 2003).
X has been found to oppose the anti-inflammatory actions of Y on Z (Alourfi, 2004).
A relationship exists between an individual’s working memory and their ability to …. (Jones, 2002).
GM varieties of maize are able to cross-pollinate with non-GM varieties (Smith, 1998; Jones, 1999).
Reference to single investigations in the past: researcher(s) as sentence subject
Smith (1999)
found that as levels of literacy and education of the population rise ….
showed that reducing X to 190
o
C decreased …. (see Figure 2) .
demonstrated that when the maximum temperature is exceeded ….
Jones et al. (2001)
d the differential impact of formal and non
analysed the data from 72 countries and concluded that ….
reviewed the literature from the period and found little evidence for this …..