Authors: Burkhart, MC de Mazariegos, L Salazar, S Lamprecht, VM

Citation: Mc. Burkhart et al., Effectiveness of a standard-rule method of calendar rhythm among Mayan couples in Guatemala, INT FAM PL, 26(3), 2000, pp. 131-136

Authors: Burkhart, MC de Mazariegos, L Salazar, S Hess, T

Citation: Mc. Burkhart et al., Incidence of irregular cycles among Mayan women who reported having regular cycles: Implications for fertility awareness methods, CONTRACEPT, 59(4), 1999, pp. 271-275