Rastegari, P., Dakhilalian, M., Berenjkoub, M., Susilo, W., Multi Designated Verifiers Signature Schemes with Threshold Verifiability: Generic Pattern and a Concrete Scheme in the Standard Model, IET Information Security, 13(5), pp. 459-468, 2019, DOI: 10.1049/iet-ifs.2018.5063