Larin M. Computation of a few smallest eigenvalues and their eigenvectors for large sparse SPD matrices // Numerical Analysis. — 2002. — # 11 — P. 75-86
Larin M. An optimal multilevel method for computing the smallest eigenpair // Numerical Analysis. — 2000. — # 9 — P. 59-67
Larin M. On the theory of algebraic multilevel incomplete factorization methods for the Stieltjes matrices // Numerical Analysis. — 1998. — # 8 — P. 57-69