Please feel free to use these papers & books for your reference.
Economics
edit- For the balassa samuelson effect
{{Cite journal
|first=Virginie
|last=Coudert
|title=Measuring the Balassa-Samuelson effect for the Countries of Central and Eastern Europe?
|year=2004
|url=http://www.banque-france.fr/fileadmin/user_upload/banque_de_france/Economists_and_researchers/122etud1.pdf
|issue=122
|journal=BANQUE DE FRANCE BULLETIN DIGEST
|publisher=Banque of France
}}
{{Cite journal
|first=Patrick
|last=K. Asea
|first2=W. Max
|last2=Corden
|title=The Balassa-Samuelson Model: An Overview
|year=1994
|url=http://www.econ.ucla.edu/workingpapers/wp710.pdf
|volume=2
|issue=3
|journal=Review of International Economics
}}
{{Cite journal
|first=Josip
|last=Funda
|first2=Gorana
|last2=Lukinić
|first3=Igor
|last3=Ljubaj
|title=Assessment of the Balassa-Samuelson Effect in Croartia
|year=2007
|url=http://www.ijf.hr/eng/FTP/2007/4/funda.pdf
|pages=321-351
|volume=31
|issue=4
|journal=Financial Theory and Practice
}}
Math
edit- Zeta function
{{Cite
|first=Floyd
|last=Williams
|year=2010
|title=Lectures on zeta functions, L-functions and modular forms with some physical applications
|url=http://library.msri.org/books/Book57/files/10williams.pdf
|publisher=MSRI publications
}}
- INTER-UNIVERSAL TEICHMULLER THEORY
{{Cite
|first=Shinichi
|last=Mochizuki
|year=2014
|title=ON THE VERIFICATION OF INTER-UNIVERSAL TEICHMULLER THEORY: A PROGRESS REPORT (AS OF DECEMBER 2014)
|url=http://www.kurims.kyoto-u.ac.jp/~motizuki/IUTeich%20Verification%20Report%202014-12.pdf
|publisher=Research Institute for Mathematical Sciences Kyoto university
}}