1950-1969

1. [Paulhus and Kohler 1952]
   Normal ratio method. Missing data interpolation. See [Alexanderson 1986]
   Relevant for homogeneity

2. [Carslaw and Jaeger 1959]
   Reference for solution of heat diffusion equation (borehole forward model).
   Relevant for paleoclimate, borehole reconstructions.

3. [Lorenz 1963]
   Butterfly paper
   Non periodic flow.

4. [Filippov 1968]
   Just because the data values are unique and possible, based on the region's climatology, does not guarantee that they are correct, for there are many types of errors that can occur during all stages of processing
   Ref. de [Peterson et al. 1998a]

5. [Glahn 1968]
   A description of cca with one example of its application to 500 mb heights and autorregresive relationship to values 24 hr earlier. Description of cca and relationship to multiple regression and discriminant analysis.
   Canonical correlation analysis, cca, multiple regression, discriminant analysis