Yang-Mills Instanton Sheaves with Higher Topological Charges
  We explicitly construct SL(2,C) Yang-Mills (weakly) three and four instanton sheaves on CP^3. These results extend the previous construction of Yang-Mills (weakly) instanton sheaves with topological charge two [18]. 
Sheng-Hong Lai, Jen-Chi Lee and I-Hsun Tsai
hep-th