@book{22272,
	author = {Pearson, H H W, and Seward, A. C.},
	title = {Gnetales,},
	publisher = {The University Press,},
	year = {2015},
	address = {Cambridge },
	note = {"Preface by the editor" signed:  A. C. Seward.},
	url = {https://doi.org/10.1017/CBO9780511709302}
}