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Polyethylene Glycol Conjugates of Methotrexate and Melphalan: Synthesis, Radiolabeling and Biologic StudiesShukla, Gauri; Tiwari, Anjani K.; Kumar, Nitin; Sinha, Deepa; Mishra, Pushpa; Chandra, Harish; Mishra, Anil K. · Cancer Biotherapy & Radiopharmaceuticals · 2008