Durna, N. 2020. Partition of the spectra for the lower triangular double band matrix as generalized difference operator Δv over the sequence spaces c and lp (1 < p < ∞). Proyecciones (Antofagasta, On line). 39, 1 (Feb. 2020), 51-71. DOI:https://doi.org/10.22199/issn.0717-6279-2020-01-0004.