  In this paper we present two efficient methods for reconstructing a rational
number from several residue-modulus pairs, some of which may be incorrect. One
method is a natural generalization of that presented by Wang, Guy and Davenport
in \cite{WGD1982} (for reconstructing a rational number from \textit{correct}
modular images), and also of an algorithm presented in \cite{Abb1991} for
reconstructing an \textit{integer} value from several residue-modulus pairs,
some of which may be incorrect.
