Geodesic
Extended eigenvalues and the Volterra operator
Glasgow mathematical journal, Tome 44 (2002) no. 3, pp. 521-534

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In this paper we consider the integral Volterra operator on the space L^2(0,1). We say that a complex number \lambda is an extended eigenvalue ofV if there exists a nonzero operator X satisfying the equation XV=\lambda VX. We show that the set of extended eigenvalues of V is precisely the interval (0,\infty ) and the corresponding eigenvectors may be chosen to be integral operators as well. 
Biswas, Animikh; Lambert, Alan; Petrovic, Srdjan. Extended eigenvalues and the Volterra operator. Glasgow mathematical journal, Tome 44 (2002) no. 3, pp. 521-534. doi: 10.1017/S001708950203015X
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     title = {Extended eigenvalues and the {Volterra} operator},
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     pages = {521--534},
     year = {2002},
     volume = {44},
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     doi = {10.1017/S001708950203015X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950203015X/}
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