Ошибка LNK2001: неразрешенный внешний символ

#ifndef __FLOAT2X2_H__
#define __FLOAT2X2_H__
 
#include "float2.h"
 
namespace Kate {
namespace Math {
 
class KATE_API float2x2 {
public:
                        float2x2            ();
                        explicit float2x2   ( const float2 &x, const float2 &y );
                        explicit float2x2   ( const float xx, const float xy, const float yx, const float yy );
                        explicit float2x2   ( const float src[ 2 ][ 2 ] );
 
    ...
    ...
 
private:
    float2              mat[ 2 ];
};
 
extern float2x2 float2x2_zero;
extern float2x2 float2x2_identity;
 
KATE_INLINE float2x2::float2x2() {
}
 
...
...
 
}//namespace Math
}//namespace Kate
 
#endif //__FLOAT2X2_H__

#include "Float2x2.h"
 
namespace Kate {
namespace Math {
 
float2x2 float2x2_zero( float2( 0.0f, 0.0f ), float2( 0.0f, 0.0f ) );
float2x2 float2x2_identity( float2( 1.0f, 0.0f ), float2( 0.0f, 1.0f ) );
 
//==============================
// float2x2::InverseSelf
//==============================
bool float2x2::InverseSelf() {
    double det, invDet, a;
 
    det = mat[0][0] * mat[1][1] - mat[0][1] * mat[1][0];
 
    if ( Abs( det ) < MAT_INV_EPS ) {
        return false;
    }
 
    invDet = 1.0f / det;
 
    a = mat[0][0];
    mat[0][0] = ( float )   (((double)mat[1][1]) * invDet);
    mat[0][1] = ( float ) - (((double)mat[0][1]) * invDet);
    mat[1][0] = ( float ) - (((double)mat[1][0]) * invDet);
    mat[1][1] = ( float )   (((double)a) * invDet);
 
    return true;
}
 
//==============================
// float2x2::ToString
//==============================
ktString float2x2::ToString( int precision ) const {
    ktString result;
 
    result.Print( "%.*f   %.*f\n%.*f   %.*f", precision, mat[0][0], precision, mat[0][1], precision, 
            mat[1][0], precision, mat[1][1] );\
    return result;
}
 
}//namespace Math
}//namespace Kate

...
extern KATE_DLL_IMPORT float2x2 float2x2_zero;
extern KATE_DLL_IMPORT float2x2 float2x2_identity;
...

...
float2x2 float2x2_zero( float2( 0.0f, 0.0f ), float2( 0.0f, 0.0f ) );
float2x2 float2x2_identity( float2( 1.0f, 0.0f ), float2( 0.0f, 1.0f ) );
...