Optical supernova remnants in nearby galaxies and their influence on   star formation rates derived from H$\alpha$ emission
  In this paper we present the most up-to-date list of nearby galaxies with optically detected supernova remnants (SNRs). We discuss the contribution of the H{\alpha} flux from the SNRs to the total H{\alpha} flux and its influence on derived star formation rate (SFR) for 18 galaxies in our sample. We found that the contribution of SNRs' flux to the total H{\alpha} flux is 5 $\pm$ 5 per cent. Due to the observational selection effects, the SNRs contamination of SFRs derived herein represents only a lower limit. 
M. M. Vucetic, B. Arbutina and D. Urosevic
astro-ph.GA