sknano.structures
sknano.structures.SWNTBundle.d
sknano.structures.SWNTBundle.dt
SWNTBundle.
dR
\(d_R=\gcd{(2n + m, 2m + n)}\)
\(d_R\) is the Greatest Common Divisor of \(2n + m\) and \(2m + n\).