Tashkin, D. P. Et Al. 2008. A 4-year trial of tiotropium in chronic obstructive pulmonary disease. NEW ENGLAND JOURNAL OF MEDICINE , vol.359, no.15 , 1543-1554.

Tashkin, D. P., Celli, B., Senn, S., Burkhart, D., Kesten, S., Menjoge, S., ... Decramer, M.(2008). A 4-year trial of tiotropium in chronic obstructive pulmonary disease. NEW ENGLAND JOURNAL OF MEDICINE , vol.359, no.15, 1543-1554.

Tashkin, Donald Et Al. "A 4-year trial of tiotropium in chronic obstructive pulmonary disease," NEW ENGLAND JOURNAL OF MEDICINE , vol.359, no.15, 1543-1554, 2008

Tashkin, Donald P. Et Al. "A 4-year trial of tiotropium in chronic obstructive pulmonary disease." NEW ENGLAND JOURNAL OF MEDICINE , vol.359, no.15, pp.1543-1554, 2008

Tashkin, D. P. Et Al. (2008) . "A 4-year trial of tiotropium in chronic obstructive pulmonary disease." NEW ENGLAND JOURNAL OF MEDICINE , vol.359, no.15, pp.1543-1554.

@article{article, author={Donald P. Tashkin Et Al. }, title={A 4-year trial of tiotropium in chronic obstructive pulmonary disease}, journal={NEW ENGLAND JOURNAL OF MEDICINE}, year=2008, pages={1543-1554} }