In was the search of the original article “The application of the formula for surface viscosity to the surface of a slowly falling droplet in the midst of a large unlimited amount of fluid which is at rest and possesses a smaller specific gravity” published by M.J. Boussinesq which was published in originally in French in the *Annales de Chimie et de physique * (Annals of Chemistry and of Physics) published in 1913. The paper formed the basis of the legendary Boussinesq-Scriven stress model. I found the volume of the scientific journal in a French library repository and is sharing the same here:

*M.J. Boussinesq, “The application of the formula for surface viscosity to the
surface of a slowly falling droplet in the midst of a large unlimited amount
of fluid which is at rest and possesses a smaller specific gravity,” Ann. Chem.
Phys., vol. 29, pp. 357–364, 1913*