Your search returned the following 4 documents:

4. High frequency of complex mutational patterns in lamivudine resistant hepatitis B virus isolates
   Maria Neumann-Fraune, Bastian Beggel, Herbert Pfister, Rolf Kaiser, and Jens Verheyen
   Journal of Medical Virology 200 (1): 39-49, 2013
   
3. Genotyping hepatitis B virus dual infections using population-based sequence data
   Bastian Beggel, Maria Neumann-Fraune, Matthias Doering, Glenn Lawyer, Rolf Kaiser, Jens Verheyen, and Thomas Lengauer
   Journal of General Virology 9 (93): 1899-1907, 2012
   
2. Role of hepatitis B virus genetic barrier in drug-resistance and immune-escape development
   Valentina Svicher, Valeria Cento, Romina Salpini, Fabio Mercurio, Maria Fraune, Bastian Beggel, Yue Han, Caterina Gori, Linda Wittkop, Ada Bertoli, Valeria Micheli, Guido Gubertini, Roberta Longo, Sara Romano, Michela Visca, Valentina Gallinaro, Nicoletta Marino, Francesco Mazzotta, Giuseppe Maria De Sanctis, Hervè Fleury, Pascale Trimoulet, Mario Angelico, Giuseppina Cappiello, Xin Xin Zhang, Jens Verheyen, Francesca Ceccherini-Silberstein, and Carlo Federico Perno
   Digestive and Liver Disease 43 (12): 975-983, 2011
   
1. Role of hepatitis B virus genetic barrier in drug-resistance and immune-escape development
   Valentina Svichera, Valeria Centoa, Romina Salpinia, Fabio Mercurioa, Maria Fraune, Bastian Beggel, Yue Hanc, Caterina Gorid, Linda Wittkope, Ada Bertolif, Valeria Michelig, Guido Gubertinig, Roberta Longoh, Sara Romanoh, Michela Viscah, Valentina Gallinaroi, Nicoletta Marinoj, Francesco Mazzottaj, Giuseppe Maria De Sanctisi, Hervè Fleurye, Pascale Trimoulete, Mario Angelicoa, Giuseppina Cappielloh, Xin Xin Zhangc, Jens Verheyenb, Francesca Ceccherini-Silbersteina, and Carlo Federico Pernoa
   Digestive and Liver Disease 43 (12): 975–983 p., 2011