TY - RPRT TI - Comparison between the successive-perturbation method and the analytic-continuation method. AU - VA Popescu AU - IM Popescu AU - MC Rusescu PY - 1989 DO - 10.1103/physreva.39.5425 UR - https://pubmed.ncbi.nlm.nih.gov/9901109/ ID - 9901109 ER -