The field has met with great success in many problems ...
The field only really took off in the late …as it became more accessible to ...
For decades, one of the most popular ideas in .…. literature is the ideathat...
Recent theoretical developments have revealed that..
Most of the research in this field is aimed at solving this problem.
This remains an open problem in the area.
The specific objective of this study was to...
This study had a specific objective to determine..
An alternative approach to the problem is ...
This can be applied to solve these problems.
A number of works have shown that this problem can be overcome by using..