Eka,

I attached two high-profile cases vs Royal Dutch Shell in the Niger Delta that were decided recently. Hope they help.

Try,  www.maxwellsci.com/print/ijfas/v1-94-117.pdf, www.sachajournals.com/user/image/owolabi002sjes.pdf, www.maxwellsci.com/print/ijfas/v1-94-117.pdf. This might be of help to you. All the best on your research.

I have a few articles uploaded on here on the Niger Delta. You may find them useful. You will also be able to draw upon literature that I have used in those papers. Best  wishes with your research

you may find the following docs useful:

Giadom et al. (2015) Environ. Earth Sci.

http://link.springer.com/article/10.1007/s12665-015-4094-3#page-1

Onyeobi and Akujieze (2015)

http://www.ajol.info/index.php/jasem/article/view/112367

Mmom and Igbuku (2015)

http://iiste.org/Journals/index.php/JETP/article/view/19386

http://www.unep.org/science/chief-scientist/Activities/DisastersandConflicts/OilPollutionintheNigerDeltaNigeria.aspx 

http://www.stakeholderdemocracy.org/uploads/SDN-UNEP-report-summary.pdf