共 5 条
[1]
Bellman R., 1953, STABILITY THEORY DIF
[2]
Bihari I., 1956, ACTA MATH ACAD SCI H, V7, P81, DOI DOI 10.1007/BF02022967
[3]
SCHURR JD, 1966, P AM MATH SOC, V17, P595
[4]
Szarski J., 1965, DIFFERENTIAL INEQUAL