Conjugate and cut loci of a two-sphere of revolution with application to optimal control Bernard Bonnard; Jean-Baptiste Caillau; Robert Sinclair; Minoru Tanaka — 2009 Annales de l'I.H.P. Analyse non linéaire
Loki: software for computing cut loci. Sinclair, Robert; Tanaka, Minoru — 2002 Experimental Mathematics
The set of poles of a two-sheeted hyperboloid. Sinclair, Robert; Tanaka, Minoru — 2002 Experimental Mathematics