Buchdahl, H. A. (1986). Power series of geometrical optics. V. Characteristic coefficients of the refracting plane. josaa/3/10/josaa-3-10-1620.pdf, 3(10), 1620–0.
doi:10.1364/JOSAA.3.001620
url to share this paper:
An interview with Sci-Hub Founder Alexandra Elbakyan Who exactly should pay for academic research