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P.~Junker, U.~Kops, U.~Merkt, T.~Darnhofer, and U.~Rossler.
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\newblock {\em Phys. Rev. B}, 49(7):4794, February 1994.

\bibitem{Lorke90:2559}
A.~Lorke~J.P. Kotthaus and K.~Ploog.
\newblock Coupling of quantum dots on \protect{GaAs}.
\newblock {\em Phys. Rev. Lett}, 64(21):2559, 1990.

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