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Research supported by a fellowship of the Program of Cultural Co-Operation between the United States of American and Spain.
On leave from Departamento de Fisica Teorica, Universidad de Zaragoza, Zaragoza, Spain.
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Vazquez, L. Elementary length in nonlinear classical fields. Lett. Nuovo Cimento 19, 37–40 (1977). https://doi.org/10.1007/BF02844293
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DOI: https://doi.org/10.1007/BF02844293