References

[1]
J. B. Schroder. Generalizing Smoothed Aggregation-Based Algebraic Multigrid. PhD dissertation, University of Illinois at Urbana-Champaign (Urbana, Illinois, 2010).
[2]
R. Tielen, M. Möller, D. Göddeke and C. Vuik, p-multigrid methods and their comparison to h-multigrid methods within Isogeometric Analysis. Computer Methods in Applied Mechanics and Engineering 372, 113347 (2020).