1. Gaffke, N., andO. Krafft: Optimum properties of latin square design and a matrix inequality. Math. Operationsforsch. Stat.8, 1977, 345–350.
2. Kiefer, J.: On the nonrandomized optimality and randomized nonoptimality of symmetrical designs. AMS29, 1958, 675–699.
3. Kiefer, J.: Construction and optimality of generalized Youden designs. In J. N. Srivastava (ed.): A survey of statistical design and linear models. Amsterdam 1975, 333–353.
4. Krafft, O.: Lineare statistische Modelle und optimale Versuchspläne. Göttingen 1978.
5. Kurotschka, V.: Optimale Versuchsplanung bei Modellen der Varianzanalyse. Habilitationsschrift. Göttingen 1972a.