Nature of the scalar $a_0(980)$ and $f_0(980)$-mesons
  It is presented a critical consideration of all unusual properties of the scalar $a_0(980)$ and $f_0(980)$-mesons in the four-quark, two-quark and molecular models. The arguments are adduced that the four-quark model is more preferable. It is discussed the complex of experiments that could finally resolve this issue. 
N.N. Achasov (S.L. Sobolev Institute for Mathematics SB RAS)