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\bibitem{Peeters+Matulis1993} {\textquotedblleft}\textit{Quantum structures created by nonhomogeneous magnetic fields}{\textquotedblright}. Peeters FM, Matulis A, Physical review : B : condensed matter and materials physics \textbf{48}, 15166 (1993).   http://doi.org/10.1103/PhysRevB.48.15166

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