This translation originally published, New York: Praeger, 1965. - Translation of 'Frei Otto-Spannweiten'. Berlin: Ullstein, 1965.
Bibliographyp.167-170. _ Includes index.
Frei Otto-structures by Conrad Roland. ISBN 0582507081. Published by Longman in 1972. Publication and catalogue information, links to buy online and reader comments.