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Liouville–Green–Olver Approximations for Complex Difference EquationsRenato Spigler; Marco Vianello; Francesca Locatelli · 1999
Finite Moments Perturbations of y" = 0 in Banach AlgebrasRenato Spigler and Marco Vianello · Proceedings of the American Mathematical Society · 1993
On the Complex Differential Equation Y″+G(z)Y=0 in Banach AlgebrasRenato Spigler; Marco Vianello · 1999
The “phase function” method to solve second-order asymptotically polynomial differential equationsRenato Spigler, Marco Vianello · 2012
Convergence analysis of the semi-implicit euler method for abstract evolution equationsSpigler, Renato; Vianello, Marco · Numerical Functional Analysis and Optimization · 1995
Asymptotic approximations for second-order linear difference equations in Banach algebras, ITania Soldà; Renato Spigler; Marco Vianello · 2008
Asymptotic approximations for second-order linear difference equations in Banach algebras, IITania Soldà; Renato Spigler; Marco Vianello · 2008
WKB-Type Approximations for Second-Order Differential Equations in C*-AlgebrasRenato Spigler and Marco Vianello · Proceedings of the American Mathematical Society · 1996