Watson, Andrew Howson, W.P. Eigenvalues and eigenvectors of a system of Bernoulli Euler beams connected together in a tree topology Eigenvalues and eigenvectors of a system of Bernoulli Euler beams connected together in a tree topology untagged;Engineering not elsewhere classified 2017-11-10
    https://repository.lboro.ac.uk/articles/conference_contribution/Eigenvalues_and_eigenvectors_of_a_system_of_Bernoulli_Euler_beams_connected_together_in_a_tree_topology/9220745