On the degree of regularity of surfaces formed by the asymptotic integrals of differential equations

Wydawnictwa / Czasopisma IMPAN / Annales Polonici Mathematici / Wszystkie zeszyty

Zofia Szmydt Annales Polonici Mathematici 2 (1955), 294-313 DOI: 10.4064/ap-2-2-294-313