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The National Science Foundation partially supported the work on this article through their grants NSF-GP-4921 to the first and NSF-GP-6114 to the second author, during their stay in the Summer of 1966 at the Institute of Fluid Dynamics and Applied Mathematics, University of Maryland, College Park, Maryland.
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Bhatia, N.P., Szegö, G.P. Weak attractors inR n . Math. Systems Theory 1, 129–133 (1967). https://doi.org/10.1007/BF01705522
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DOI: https://doi.org/10.1007/BF01705522