Robuta

https://annals.math.princeton.edu/1977/105-3/p07 Strong approximation for semi-simple groups over function fields | Annals of Mathematics annals of mathematics strong approximation simple groups semi function https://research.knu.ac.kr/en/publications/accurate-ber-approximation-for-sim-with-bpsk-and-multiple-transmi/ Accurate BER Approximation for SIM with BPSK and Multiple Transmit Apertures over Strong... accurate ber approximation sim bpsk