BasdouriO., Braghtha A., and Hammami S. “The Second Cohomology Spaces $\mathcal{K}(2)$ With coefficents in the Superspace of Weighted Densities”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 72, no. 10, Oct. 2020, pp. 1323-34, doi:10.37863/umzh.v72i10.6030.