Key Laboratory of Mathematics and Complex Systems;
Ministry of Education;
Institution of Mathematics and Mathematical Education;
School of Mathematical Sciences;
Beijing Normal University;
Beijing 100875;
China;
School of Chinese Medicine;
Beijing University of Chinese Medicine;
Beijing 100029;
China;
School of Mathematical Sciences;
Peking University;
Beijing 100871;
China;
Bilinear spectral multipliers; Heisenberg groups; boundedness;