中国科学院数学与系统科学研究院期刊网
THE EXPONENT OF THIRD ORDER DIFFERENTIAL EQUATIONS WITH UNBOUNDED PIECEWISE CONSTANT MATRIX AND 1TS PERTURBATION EQUATIONS
Gao Feng-xin, Zhang Zhen-guo, Hou Zhan-yuan
Acta Mathematicae Applicatae Sinica . 1988, (3): 340 -357 .  DOI: 10.12387/C1988037