There are some literature mapping tools (like Research Rabbit (free), SciSpace (free + paid), Semantic Scholar (free ... relevant links to the sources suggests this is sincere. Example of its search ...

It is crucial that before you develop themes that you have first read ALL of the articles you intend to use in your literature review, so you have a clear understanding of the information. For example ...

You will typically need an upper second-class honours degree or an international equivalent in English Literature or a related subject, and 60% or above in any dissertation/research component. In ...

This guide focuses on the review matrix step in the literature review process and offers tips on how to use it effectively ... It may be important to note where the research was completed. For example ...