Jordan Chains for Lambda Matrices, II. (Short Communication). P. Lancaster — 1970 Aequationes mathematicae
Spectral Properties of a Polynomial Operator. P. LANCASTER; M.V. PATTABHIRAMAN — 1969 Numerische Mathematik
Convergence properties of ART and SOR algorithms. P. Lancaster; L. Elsner; I. Koltracht — 1991 Numerische Mathematik