G. T. Lyons

A 233 km Circumference Tunnel for $e^+$$e^-$, $p$$\bar {p}$, and $\mu^{+} \mu^{-}$ Colliders

G. T. Lyons, 2011, 1112.1105.

A 233 km tunnel for lepton and hadron colliders

L. Cremaldi, D. Summers, A. Datta, 2012, 1207.7354.