Reanalysis of the $$Y(3940)$$ Y ( 3940 ) , $$Y(4140)$$ Y ( 4140 ) , $$Z_c(4020)$$ Z c ( 4020 ) , $$Z_c(4025)$$ Z c ( 4025 ) , and $$Z_b(10650)$$ Z b ( 10650 ) as molecular states with QCD sum rules
European physical journal. C, Particles and fields