Tobler, Waldo (1973), "The hyperelliptical and other new pseudocylindrical equal area map projections", Journal of Geophysical Research, 78 (11): 1753—1759, Bibcode:1973JGR....78.1753T, doi:10.1029/JB078i011p01753.
harvard.edu
ui.adsabs.harvard.edu
Tobler, Waldo (1973), "The hyperelliptical and other new pseudocylindrical equal area map projections", Journal of Geophysical Research, 78 (11): 1753—1759, Bibcode:1973JGR....78.1753T, doi:10.1029/JB078i011p01753.