@article{ieee:sign-detection,
	author = {Chunsheng Liu and Shuang Li and Faliang Chang and Yinhai Wang},
	title = {Machine Vision Based Traffic Sign Detection Methods: Review,
		  Analyses and Perspectives},
	year = {2019},
	url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8746141}
}

@online{wikipedia:hough,
	title = {Hough transform},
	url = {https://en.wikipedia.org/wiki/Hough_transform}
}

@article{sciencedirect:hough,
	author = {Mark S. Nixon and Alberto S and Aguado},
	title = {Feature Extraction and Image Processing for Computer Vision},
	year = {2020},
	url = {https://www.sciencedirect.com/topics/computer-science/hough-transforms}
}

@manual{opencv:hough,
	title = {Hough Line Transform},
	url = {https://docs.opencv.org/3.4/d9/db0/tutorial_hough_lines.html}
}

@manual{openmv:find_lines,
	title = {image — machine vision},
	url = {https://docs.openmv.io/library/omv.image.html}
}