Please try Raco et al., 2010 (https://www.infona.pl/resource/bwmeta1.element.springer-e7da9099-a0b3-3a5c-983b-b1772df22575).
This study is important as it provides repeat measurements (11 separate surveys) of LFG emissions using a state-of-the-art accumulation chamber method and compares the actual measured emissions against empirical LFG emission models. It is one of the better works I have read. Onk et al 2010 also provide a very sound review of LFG emissions and dynamics. They note, as do many other workers, that the various kinetic decay models can be wildly inaccurate producing large variance in emissions for the same landfill.