Algorithm 586: ITPACK 2C: A FORTRAN Package for Solving Large Sparse Linear Systems by Adaptive Accelerated Iterative Methods
David R. Kincaid, John R. Respess, David M. Young, Rober R. Grimes · ACM Transactions on Mathematical Software · 1982
A matrix has Property A if and only if it is a diagonal matrix, or else there exists a rearrangement of the rows and corresponding columns of the matrix which corresponds to a red-black partitioning An L-matrix has positive diagonal elements and nonpositlve off-diagonal elements.