Zelle, Hein, Gerrian Appledoorn, Gerritt Burgers, and Gert Jan Van Oldenborgh (março de 2004). «Relationship Between Sea Surface Temperature and Thermocline Depth in the Eastern Equatorial Pacific». Journal of Physical Oceanography. 34: 643. Bibcode:2004JPO....34..643Z. CiteSeerX10.1.1.12.3536. doi:10.1175/2523.1 !CS1 manut: Nomes múltiplos: lista de autores (link)
Zelle, Hein, Gerrian Appledoorn, Gerritt Burgers, and Gert Jan Van Oldenborgh (março de 2004). «Relationship Between Sea Surface Temperature and Thermocline Depth in the Eastern Equatorial Pacific». Journal of Physical Oceanography. 34: 643. Bibcode:2004JPO....34..643Z. CiteSeerX10.1.1.12.3536. doi:10.1175/2523.1 !CS1 manut: Nomes múltiplos: lista de autores (link)
Bjerknes, J. (March 1969) "Atmospheric teleconnections from the equatorial Pacific," Monthly Weather Review, 97 (3) : 163–172. From pp. 167–168: "It seems reasonalble to assume that it is the gradient of sea temperature along the Equator which is the cause of the thermal circulation entered in figure 8. Hereafter, in the present article that circulation will be referred to as the "Walker Circulation" since it can be shown to be an important part of the mechanism of Walker's "Southern Oscillation." " Available at: N.O.A.A.
Zelle, Hein, Gerrian Appledoorn, Gerritt Burgers, and Gert Jan Van Oldenborgh (março de 2004). «Relationship Between Sea Surface Temperature and Thermocline Depth in the Eastern Equatorial Pacific». Journal of Physical Oceanography. 34: 643. Bibcode:2004JPO....34..643Z. CiteSeerX10.1.1.12.3536. doi:10.1175/2523.1 !CS1 manut: Nomes múltiplos: lista de autores (link)