with this code

Qt Code: 
  1. template<int Degree>
  2. PPolynomial<Degree> PPolynomial<Degree>::GaussianApproximation(const double& width)
  3. {
  4. 	return PPolynomial<Degree-1>::GaussianApproximation().MovingAverage(width);
  5. }
  6.  
  7. template<>
  8. PPolynomial<0> PPolynomial<0>::GaussianApproximation(const double& width)
  9. {
  10. 	return ConstantFunction(width);
  11. }
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MSVC 2008 Link error:
1>------ Build started: Project: Protable-Coordinate Measuring Machines, Configuration: Debug Win32 ------
1>Moc'ing mainwindow.h...
1>Compiling...
1>moc_mainwindow.cpp
1>mainwindow.cpp
1>main.cpp
1>Generating Code...
1>Linking...
1>LINK : C:\Users\Suriyong\Documents\Visual Studio 2008\Projects\Protable-Coordinate Measuring Machines\Debug\Protable-Coordinate Measuring Machines.exe not found or not built by the last incremental link; performing full link
1>mainwindow.obj : error LNK2005: "public: static class PPolynomial<0> __cdecl PPolynomial<0>::GaussianApproximation(double const &)" (?GaussianApproximation@?$PPolynomial@$0A@@@SA?AV1 @ABN@Z) already defined in main.obj
1>poisson_reconstruction_2.obj : error LNK2005: "public: static class PPolynomial<0> __cdecl PPolynomial<0>::GaussianApproximation(double const &)" (?GaussianApproximation@?$PPolynomial@$0A@@@SA?AV1 @ABN@Z) already defined in main.obj
1>moc_mainwindow.obj : error LNK2005: "public: static class PPolynomial<0> __cdecl PPolynomial<0>::GaussianApproximation(double const &)" (?GaussianApproximation@?$PPolynomial@$0A@@@SA?AV1 @ABN@Z) already defined in main.obj
1>C:\Users\Suriyong\Documents\Visual Studio 2008\Projects\Protable-Coordinate Measuring Machines\Debug\Protable-Coordinate Measuring Machines.exe : fatal error LNK1169: one or more multiply defined symbols found
1>Build log was saved at "file://c:\Users\Suriyong\Documents\Visual Studio 2008\Projects\Protable-Coordinate Measuring Machines\Protable-Coordinate Measuring Machines\Debug\BuildLog.htm"
1>Protable-Coordinate Measuring Machines - 4 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

What the problem of this code? and what solution can fix this?
Thankyou.