Polly, Zinat Ara, et al. “Relationship Of FEF<sub>25-75< Sub>, Pefr And SVC With Estrogen And Progesterone Level In Postmenopausal Women”. Journal of Bangladesh Society of Physiologist, vol. 6, no. 2, Feb. 2012, pp. 116-21, doi:10.3329/jbsp.v6i2.9761.