Lam Xuan Chau Ngo,
"A criterion for existence of rational general solutions of planar systems of ODEs"
, Serie RISC Report Series, Nummer 09-13, RISC, JKU Linz, Schloss Hagenberg, 4232 Hagenberg, 7-2009
Original Titel:
A criterion for existence of rational general solutions of planar systems of ODEs