The search results suggest "v91 estim" likely refers to a specific numerical interpolation method (V91 interpolation) or a paper from a scientific journal volume (Volume 91) 1. V91 Interpolation (Atmospheric & Soil Science)
0.1Ω precision shunt (4-wire type) and a small flathead screwdriver. v91 estim
Regardless of the specific field, your paper should include these critical sections: Introduction: The search results suggest "v91 estim" likely refers