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Borovskikh, A.V., Lazarev, K.P. Fourth-Order Differential Equations on Geometric Graphs. Journal of Mathematical Sciences 119, 719–738 (2004). https://doi.org/10.1023/B:JOTH.0000012753.65477.23
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DOI: https://doi.org/10.1023/B:JOTH.0000012753.65477.23