A general weak constraint applicable to the operational 4VDAR data assimilation systems

Zupanski, D.

Mon. Wea. Rev., 125, 2274-2292

Read more at http://journals.ametsoc.org/doi/full/10.1175/1520-0493(1997)125%3C2274%3AAGWCAT%3E2.0.CO%3B2