@incollection{Velychko12, author = {L. G. Velychko and Yu. K. Sirenko and E. D. Vinogradova}, title = {Analytical Grounds for Modern Theory of Two- Dimensionally Periodic Gratings}, booktitle = {Solutions and Applications of Scattering, Propagation, Radiation and Emission of Electromagnetic Waves}, publisher = {IntechOpen}, address = {Rijeka}, year = {2012}, editor = {Ahmed Kishk}, chapter = {5}, doi = {10.5772/51007}, url = {https://doi.org/10.5772/51007} }