The Spiral Arms and Interarm Separation of the Milky Way: An Updated Statistical Study

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The exciting lives of giant molecular clouds (2013, background): “We changed to N = 2 simply because for many roughly symmetric galaxies, the number of arms is 2 rather than 4 (the choice of the latter previously was also influenced partly by the supposed structure of our Galaxy (see Cox & Gómez 2002 and Vallée 2005)).”
On the fine structure of the Cepheid metallicity gradient in the Galactic thin disk (2014, methodology): “Note that the association between the candidate CGs and the Perseus arm does requires a more detailed analysis, since we adopted a qualitative model of the Galactic logarithmic spiral arms (Vallée 2005).”
The formation of molecular clouds in spiral galaxies (2006, methodology): “We take N = 4 for a four-armed potential, and a pitch angle of α = 15◦, comparable with the Milky Way (Vallée 2005).”
Dawes Review 4: Spiral Structures in Disc Galaxies (2014, background): “The number of spiral arms in our Galaxy is still debated somewhat (see e.g. Vallée 2005), but is most frequently considered to be either 2 or 4.”