• Bifurcation structure of a driven van der Pol-type equationHertzen, R. von; Kongas, Olav; Engelbrecht, JüriProceedings of the 6th Finnish Mechanics Days, September 5-6, 1997, Oulu, Finland1997 / p. 419-435: ill
• Bifurcation structure of a periodically driven nerve pulse equation modelling cardiac contractionKongas, Olav; Hertzen, R. von; Engelbrecht, JüriChaos, solitons & fractals1999 / 1, p. 119-136
• Cardiac dynamics involving arrhythmias and continuum mechanicsEngelbrecht, Jüri; Vendelin, Marko; Kongas, Olav; Hertzen, R. vonTrends in continuum physics TRECOP 981999 / p. 113-118 https://research.aalto.fi/en/publications/cardiac-dynamics-involving-arrhythmias-and-continuum-mechanics
• Complex dynamics of cardic rhythmEngelbrecht, Jüri; Kongas, Olav; Hertzen, R. vonInt. Conf. on Nonlinear Dynamics, Chaotic and Complex Systems, Zakopane, 7-12 Nov., 1995 : book of abstracts1995 / p. 253
• Driven nonlinear oscillators for modeling cardiac phenomenaEngelbrecht, Jüri; Hertzen, R. von; Kongas, OlavIUTAM Symposium Chaos'97 : Applications of Nonlinear and Chaotic Dynamics in Mechanics, Ithaca, New York, USA, July 27-Aug 1 1997 : abstracts1997 / p. 24-25 https://research.aalto.fi/en/publications/driven-nonlinear-oscillators-for-modeling-cardiac-phenomena
• Driven oscillators for modelling cardiac phenomenaEngelbrecht, Jüri; Hertzen, R. von; Kongas, OlavProc. IUTAM Symp. New Applications of Nonlinear and Chaotic Dynamics in Mechanics1999 / p. 333-342
• Response characteristics of a cardiac nerve pulse equation stimulated periodically by Dirac delta spikesEngelbrecht, Jüri; Kongas, Olav; Hertzen, R. vonInternational Conference on Self-Organization of Complex Structures : From Individual to Collective Dynamics, Berlin, 24-28 September, 1995 : book of abstracts1995 / p. 35