MathSciNet bibliographic data MR575082 34B05 Lins Neto, Alcides On the number of solutions of the equation $dx/dt=\sum \sp{n}\sb{j=0}\,a\sb{j}(t)x\sp{j}$$dx/dt=\sum \sp{n}\sb{j=0}\,a\sb{j}(t)x\sp{j}$, $0\leq t\leq 1$$0\leq t\leq 1$, for which $x(0)=x(1)$$x(0)=x(1)$. Invent. Math. 59 (1980), no. 1, 67–76. Article

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