@book{44927,
	author = {Yu Jin Ahn et al...},
	title = { Variable Focal Length Lenses Made of Gelatin },
	publisher = {  American Association of Physics Teachers},
	year = { September 2023},
	series = { American Association of Physics Teachers ,American Institute of Physics, Volume 61, Issue 6},
	address = {Washington , DC},
	url = {https://doi.org/10.1119/5.0084702}
}