Papers

Johan Davidov, Stefan Ivanov, Ivan Minchev, The twistor space of a quaternionic contact manifold, (2010) math.DG

Stefan Ivanov, Ivan Minchev, Dimiter Vassilev, The optimal constant in the L^2 Folland-Stein inequality on the quaternionic Heisenberg group, (2010) math.AP

Stefan Ivanov, Ivan Minchev, Dimiter Vassilev, Extremals for the Sobolev inequality on the seven dimensional quaternionic Heisenberg group and the quaternionic contact Yamabe problem, J. Eur. Math. Soc. (JEMS) 12, No. 4, 1041-1067 (2010) math.DG/

Stefan Ivanov, Ivan Minchev, Dimiter Vassilev, Quaternionic contact Einstein structures and the quaternionic contact Yamabe problem, International Centre for Theoretical Physics preprint IC/2006/117, (2006), submited math.DG/

Stefan Ivanov, Ivan Minchev, Simeon Zamkovoy, Twistor and Reflector Spaces of Almost Para-Quaternionic Manifolds, Handbook of pseudo-Riemannian geometry and supersymmetry, Corte's, Vicente (ed.), IRMA-series, Publishing House of the EMS 16 (2010), 477-496 math.DG/

Stefan Ivanov, Ivan Minchev, Simeon Zamkovoy, Twistors of Almost Quaternionic Manifolds, 2005 math.DG/

Stefan Ivanov, Ivan Minchev, Quaternionic Kaehler and hyperKaehler manifolds with torsion and twistor spaces,
J. reine angew. Math. 567 (2004), 215-233 math.DG/

Ivan Minchev, The Biquard connection on Riemannian quaternionic contact manifolds,
Ann. Sofia Univ., Fac. Math. and Inf., 98, (2008), 157-170