Potential of multispectral imaging technology for assessment coniferous forests bitten by a bark beetle in Central BulgariaMarina Stoyanova, Alexander Kandilarov, Vesselin Koutev, Olga Nitcheva and Polya DobrevaMATEC Web Conf., 145 (2018) 01005DOI: https://doi.org/10.1051/matecconf/201814501005