@misc{Cha-2020-1,
    title={Virtual Seminar Series: Waves in Complex Continua (Wavinar) },
    address={https://www.icms.org.uk/V_Wavinar.php },
    journal={Recent advances on the preconditioning of 3D fast Boundary 
           Element Solvers for 3D acoustics and elastodynamics },
    year={2020 },
    month={6},
    comment={{umatype:'online_talk'}},
}