Sierra Ramos, R., Chinnock Mc'Neil, A. E., Ohshima, H., Pignatelli, B., Malaveille, C., Gamboa, C., . . . Bartsch, H. (1993). In vivo Nitrosoproline formation and other risk factors in Costa Rican Children from high-and low-risk areas for gastric cancer.

Sierra Ramos, Rafaela, Anne Eliza Chinnock Mc'Neil, Hiroshi Ohshima, Brigitte Pignatelli, Christian Malaveille, C. Gamboa, Sibylle Teuchmann, Nubia Muñoz Calero, و Helmut Bartsch. In Vivo Nitrosoproline Formation and Other Risk Factors in Costa Rican Children From High-and Low-risk Areas for Gastric Cancer. 1993.

Sierra Ramos, Rafaela, et al. In Vivo Nitrosoproline Formation and Other Risk Factors in Costa Rican Children From High-and Low-risk Areas for Gastric Cancer. 1993.