References Alexander horned sphere




alexander, j. w. (1924), example of connected surface bounding region not connected , proceedings of national academy of sciences of united states of america, national academy of sciences, 10 (1): 8–10, doi:10.1073/pnas.10.1.8, issn 0027-8424, jstor 84202 
d. fuchs, s. tabachnikov, mathematical omnibus: thirty lectures on classic mathematics
hatcher, a., algebraic topology, https://www.math.cornell.edu/~hatcher/at/at.pdf
hocking, john gilbert; young, gail sellers (1988) [1961]. topology. dover. isbn 0-486-65676-4. 
spivak, michael (1999). comprehensive introduction differential geometry (volume 1). publish or perish. isbn 0-914098-70-5. 






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