Nelson Siegel paperweb.math.ku.dk/~rolf/teaching/NelsonSiegel.pdfNelson Siegel paper
“Interview with Claudia Altman-Siegel, founder of the ...
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“Interview with Claudia Altman-Siegel, founder of the gallery Altman Siegel in San Francisco,” Contemporaryartgalleries.net, April 14, 2017