@article {259, title = {Explaining the {\textquotedblleft}Mystery{\textquotedblright} of Periodicity in Inter-Transmission Times in Two-Dimensional Event-Triggered Controlled Systems}, journal = {IEEE Transactions on Automatic Control}, volume = {68}, number = {2}, year = {2023}, month = {February}, pages = {912-927}, author = {R. Postoyan and R. G. Sanfelice and W. P. M. H. Heemels} }