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# References

1.
  Smith, W.H.F., and P. Wessel, Gridding with continous curvature splines in tension, Geophysics, 55, 293–-305, 1990.

2.
  Wessel, P., and W.H.F. Smith, Free software helps map and display data, EOS Trans. AGU, 72, 441, 1991.

3.
  Wessel, P., and W.H.F. Smith, New version of the Generic Mapping Tools released, EOS Trans. AGU, 76, 329, 1995.

4.
  Wessel, P., and W.H.F. Smith, A global, self-consistent, hierarchical, high-resolution shoreline database, J. Geophys. Res., 101, 8741-–8743, 1996.

5.
  Wessel, P., and W.H.F. Smith, New, improved version of the Generic Mapping Tools released, EOS Trans. AGU, 79, 579, 1998.

6.
  Wessel, P., and W.H.F. Smith, The Generic Mapping Tools Technical Reference and Cookbook, Version 3.3, pp. 132, 1999.