变分法逆问题研究的若干进展
丁光涛
Some Progressions in Study of the Inverse Problem of the Calculus of Variations
DING Guangtao
北京大学学报(自然科学版) . 2016, (4): 732 -740 .  DOI: 10.13209/j.0479-8023.2016.070