Michael V. Basin Maria Aracelia Alcorta-Garcia Alfredo Alanís-Durán Optimal filtering for linear systems with state and multiple observation delays. 547-555 2008 39 Int. J. Syst. Sci. 5 https://doi.org/10.1080/00207720701847661 db/journals/ijsysc/ijsysc39.html#BasinAA08