Added missing pubblication year

Author: Cirdans-Home

publication.md

@@ -12,7 +12,7 @@ Publications describing the structure of the PSBLAS: Parallel Sparse BLAS, the l
 ## AMG4PSBLAS
 This package was previously known as MLD2P4, these are the publication relative to its architecture and the preconditioner that implements.
 1. D'Ambra, Pasqua, Fabio Durastante, Salvatore Filippone, Stefano Massei, Stephen Thomas. " Optimal Polynomial Smoothers for Parallel AMG" (2024) *submitted* [arXiv:2407.09848](https://arxiv.org/abs/2407.09848)
-1. D'Ambra, Pasqua, Fabio Durastante, and Salvatore Filippone. "AMG preconditioners for linear solvers towards extreme scale." SIAM Journal on Scientific Computing 43(5), S679–S703.
+1. D'Ambra, Pasqua, Fabio Durastante, and Salvatore Filippone. "AMG preconditioners for linear solvers towards extreme scale." SIAM Journal on Scientific Computing 43(5) (2021), S679–S703.
 2. D'Ambra, Pasqua; di Serafino, Daniela; Filippone, Salvatore. MLD2P4: a package of parallel algebraic multilevel domain decomposition preconditioners in Fortran 95. ACM Trans. Math. Software 37 (2010), no. 3, Art. 30, 23 pp.
 3. D'Ambra, Pasqua; di Serafino, Daniela; Filippone, Salvatore. On the development of PSBLAS-based parallel two-level Schwarz preconditioners. Appl. Numer. Math. 57 (2007), no. 11-12, 1181--1196.
 4. Buttari, Alfredo; D'Ambra, Pasqua; di Serafino, Daniela; Filippone, Salvatore. 2LEV-D2P4: a package of high-performance preconditioners for scientific and engineering applications. Appl. Algebra Engrg. Comm. Comput. 18 (2007), no. 3, 223--239.