• Analysis of shallow saddle-shape shell cable roofsÕiger, KarlThird international conference on space structures : [proceedings]1984 / p. 737-743 : ill https://www.ester.ee/record=b1600316*est https://www.scopus.com/pages/publications/0021586701?origin=resultslist
• Experimental investigations of space structures of roofs in the Estonian SSRKulbach, Valdek; Laul, Heinrich; Tärno, Ülo; Õiger, KarlIASS international congress on theory and experimental investigation of spatial structures, application of shells in engineering structures : proceedings, held in Moscow, USSR, 23-28 September 1985. Vol. 21985 / p. 378-394 https://www.scopus.com/pages/publications/0022316148?origin=resultslist