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   <dim:field mdschema="dc" element="contributor" qualifier="advisor" lang="en_US">Sigurtur Helgason.</dim:field>
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   <dim:field mdschema="dc" element="date" qualifier="issued" lang="en_US">1973</dim:field>
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   <dim:field mdschema="dc" element="description" lang="en_US">Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1973.</dim:field>
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   <dim:field mdschema="dc" element="description" lang="en_US">Bibliography: leaves 120-123.</dim:field>
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