@book{5752,
	author = {Ludwig, George H},
	title = {Opening Space Research:},
	publisher = {American Geophysical Union,},
	year = {c2011},
	address = {Florida Avenue :},
	url = {https://agupubs.onlinelibrary.wiley.com/doi/pdfdirect/10.1029/062SP?download=true}
}