On the characteristics for a system of partial differential equations of the first order in a special case

Wydawnictwa / Czasopisma IMPAN / Annales Polonici Mathematici / Wszystkie zeszyty

Z. Kamont, W. Pawelski Annales Polonici Mathematici 29 (1974), 215-228 DOI: 10.4064/ap-29-3-215-228