@inproceedings{c.1884sur,
title={Sur la formule $$hu'_x = \Delta u_x - \frac{h}{2} \cdot \Delta u'_x + \frac{{B_1 \cdot h^2 }}{{I \cdot 2}} \cdot \Delta u''_x - \frac{{B_2 h^4 }}{{I \cdot 2 \cdot 3 \cdot 4}} \cdot \Delta u_x^{IV} + etc.$$ },
author={C. J. Malmsten},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202934140023784},
booktitle={Acta Mathematica},
volume={5},
number={1},
pages={1-46},
year={1884},
}
C. J. Malmsten. Sur la formule $$hu'_x = \Delta u_x - \frac{h}{2} \cdot \Delta u'_x + \frac{{B_1 \cdot h^2 }}{{I \cdot 2}} \cdot \Delta u''_x - \frac{{B_2 h^4 }}{{I \cdot 2 \cdot 3 \cdot 4}} \cdot \Delta u_x^{IV} + etc.$$ . 1884. Vol. 5. In Acta Mathematica. pp.1-46. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108202934140023784.