@book{30664,
	author = {Tratner, Michael},
	title = {Crowd Scenes},
	url = {https://library.oapen.org/bitstream/20.500.12657/31586/1/626974.pdf||https://library.oapen.org/bitstream/20.500.12657/31586/1/626974.pdf||https://library.oapen.org/bitstream/20.500.12657/31586/1/626974.pdf}
}