To what theory of deflationary spirals are you referring? Here are few good articles on the theory of deflation.
http://mises.org/journals/qjae/pdf/qjae6_4_8.pdf
http://mises.org/journals/qjae/pdf/qjae6_4_4.pdf
http://library.mises.org/books/Jorg%20Guido%20Hulsmann/Deflation%20and%20Liberty.pdf
