Heilbronn, Georges Sur la construction des équations \(s+f(x,y,z,p,q,r)=0\) qui possedent un invariant du second ordre. (French) Zbl 0021.02803 C. R. Acad. Sci., Paris 208, 1380-1382 (1939). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:Differential equations, general theory × Cite Format Result Cite Review PDF