K-band spectroscopy of IGR J16358-4726 and IGR J16393-4643: two new symbiotic X-ray binaries E. Nespoli, J. Fabregat and R. E. Mennickent A&A, 516 (2010) A94 Published online: 21 July 2010 DOI: 10.1051/0004-6361/200913410