Some problems of calculating and constructing the wooden shells of negative curvatureKulbach, Valdek; Õiger, KarlWood, ferrocement, and plastics in shells and spatial structures: proceedings of the IASS Symposium Held June 9-17, 1980, at the University of Oulu1980 / p. 195-196

The modeling and erecting the wooden hypar shells in EstoniaÕiger, Karl; Lavrov, Anatoli; Just, Elmar-JaanWood, ferrocement and plastics in shells and spatial structures : proceedings of the IASS symposium held June 9-14, 1980, at the University of Oulu, Oulu Finland1980 / p. 231-233