1. Wong, K. V. and Hernandez, A., “A Review of Additive Manufacturing,” ISRN Mechanical Engineering, p. 10, 2012.
2. Halterman, T. E., “Where is the 4D Printing Market Headed?-Report Says $555.6M Annually by 2025,” https://3dprint.com/78035/4d-printing-market/ (Accessed 16 JUN 2017)
3. Huang, T. Y., Sakar, M. S., Mao, A., Petruska, A. J., Qiu, F., et al., “3D Printed Microtransporters: Compound Micromachines for Spatiotemporally Controlled Delivery of Therapeutic Agents,” Advanced Materials, Vol. 27, No. 42, pp. 6644–6650, 2015.
4. Shida Miao, W. Z., Castro, N. J., Nowicki, M., Zhou, X., Cui, H., et al., “4D Printing Smart Biomedical Scaffolds with Novel Soybean Oil Epoxidized Acrylate,” Scientific Reports, Vol. 6, Paper No. 27226, 2016.
5. Sonkaria, S., Kim, H.-T., Kim, S.-Y., Kumari, N., Kim, Y. G., et al., “Ionic Liquid-Induced Synthesis of a Graphene Intercalated Ferrocene Nanocatalyst and its Environmental Application,” Applied Catalysis B: Environmental, Vol. 182, pp. 326–335, 2016.