00299nam a2200121 a 450000500170000002000150001708200220003210000060005411000200006024500400008026000390012030000180015920251203091511.0  a0719014913  a515.353,bDD, Sol  d_  aFordy, Allan P.  aSoliton theory: a survey of results  aManchesterbUniversity Pressc1990  a450p., 22 cm.