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, và 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.