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3. Does bifurcation from the essential spectrum occur?;Benci;Comm. Partial Differential Equations,1981
4. Methodus universalis determinandae curvaturae fili a potentiis quamcunque legem inter se observantibus extensi, una cum solutione problematum quorundam novorum eo pertinentium;Bernoulli;Comm. Acad. Sci. Petrop.,1728
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