J. B. Carrell.Polish-North American Seminar on Group Actions and Vector Field(1981 : Univ. of British Columbia)：Group actions and vector fields; proceedings; University of British Columbia, Jan. 15-Feb.25 1981.Springer,1982.
Polish-North American Seminar on Group Actions and Vector Field(1981 : Univ. of British Columbia)：Group actions and vector fields; proceedings; University of British Columbia, Jan. 15-Feb.25 1981
