Merz formulas
All stereological formulas
Length of semi-circle (L)
References
Howard, C. V., Reed, M. G. (2010). Unbiased stereology. Liverpool, UK: QTP Publications. {See equation 6.4}
Weibel, E.R. (1979). Stereological Methods. Vol. 1: Practical methods for biological morphometry. London, UK: Academic Press.