Esteemed colleagues may want to check the MR review done by Taira for this book. 

https://www.researchgate.net/publication/264551800_MR1478921_%2898k35026%29_3-_Elliptic_boundary_value_problems_with_indefinite_weights_variational_formulations_of_the_principal_eigenvalue_and_applications._%28English_summary%29

Book Elliptic Boundary Value Problems with Indefinite Weights +

Data MR1478921 (98k:35026) 3- Elliptic boundary value problems wi...

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