APA

Vasudevan Vishnu Au, University of Delhi. Faculty of Medical Science. Department of General Medicine, Giri Subhash Gu & University of Delhi. Faculty of Medical Science. Department of General Medicine. (2013). To assess the efficacy of sildenafil in improving the exercise capasity and quality of life in copd patients with secondary pulmonary hypertension. : .

Chicago

Vasudevan Vishnu Au, University of Delhi. Faculty of Medical Science. Department of General Medicine, Giri Subhash Gu and University of Delhi. Faculty of Medical Science. Department of General Medicine. 2013. To assess the efficacy of sildenafil in improving the exercise capasity and quality of life in copd patients with secondary pulmonary hypertension. : .

Harvard

Vasudevan Vishnu Au, University of Delhi. Faculty of Medical Science. Department of General Medicine, Giri Subhash Gu and University of Delhi. Faculty of Medical Science. Department of General Medicine. (2013). To assess the efficacy of sildenafil in improving the exercise capasity and quality of life in copd patients with secondary pulmonary hypertension. : .

MLA

Vasudevan Vishnu Au, University of Delhi. Faculty of Medical Science. Department of General Medicine, Giri Subhash Gu and University of Delhi. Faculty of Medical Science. Department of General Medicine. To assess the efficacy of sildenafil in improving the exercise capasity and quality of life in copd patients with secondary pulmonary hypertension. : . 2013.