latex参考文献，首字母大写

title条目用双层{}括号,

除此之外，title内部的标题名字要手工改为首字母大写。

@article{Kingma2014,
	journal={arXiv preprint arXiv:1412.6980},
	author = {Kingma, Diederik P. and Ba, Jimmy},
	title = {{Adam: A Method for Stochastic Optimization}},
	year = {2014},
}