1. M. P. Bendsoe and O. Sigmund, Topology Optimization: Theory, Methods and Applications (Springer Sci. & Business Media, Berlin, 2003).
2. J. Bannister, L. Fratta, and M. Gerla, in Proc. EFOC/LAN'90. Munich, Germany,
1990, p. 53.
3. J. S. Jensen and O. Sigmund, Laser & Photonics Rev. 5 (2), 308 (2011).
4. I. Andonegui, I. Calvo, and A. J. Garcia-Adeva, Appl. Phys. A 115, 433 (2014).
5. I. B. Minin, E. E. Nuzhin, A. I. Boyko, et al., in 2018 Engineering and Telecommun. (EnT-MIPT). Moscow, Nov. 15–16 2018 (IEEE, New York, 2018), p. 146.