Eusebius J. Doedel Willy Govaerts Yuri A. Kuznetsov Annick Dhooge Numerical Continuation of Branch Points of Equilibria and Periodic orbits. 841-860 2005 15 I. J. Bifurcation and Chaos 3 http://dx.doi.org/10.1142/S0218127405012491 db/journals/ijbc/ijbc15.html#DoedelGKD05