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Is a circle determined by horizontal and vertical projection? (Ist ein Kreis durch Grund- und Aufriss eindeutig festgelegt?) (German)
IBDG (Informationsbl. Darst. Geom.) 20, No. 2, 52-54 (2001).
Classification: G80
1
Computer-assisted descriptive geometry. Computerunterstuetzte Darstellende Geometrie. (German)
Stuttgart: Teubner. 1988. 248 p. Ser. Title: MikroComputer-Praxis. [ISBN 3-519-02549-3]
Classification: G80 R20
2
Two special articular quadrangles. Zwei besondere Gelenkvierecke. (German)
Prax. Math. (Oct 1978) v. 20(10) p. 299-303. [ISSN 0032-7042]
Classification: G33
3
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