Citation: Andersson, S.; Mumme, W.G.; Wadsley, A.D. (1966). Multiple phase formation in the binary system Nb2 O5-W O3. V. The structure of W4 Nb26 O77 an ordered intergrowth of the adjoining compounds W Nb12 O33 and W3 Nb14 O44. Acta Crystallographica (1,1948-23,1967), 21, pp. 802-808.