Polaronic effects on the energy levels of a double donor impurity in quantum wells in the presence of a magnetic fieldZi-xin Liu, Zhen-jiang Lai Yong-chang Huang, Ya Liu and Guo-jun ChengEur. Phys. J. B, 12 3 (1999) 347-350DOI: https://doi.org/10.1007/s100510051015