This a full-text version of the seminal paper from 1970:
Swan HJ, Ganz W, Forrester J, Marcus H, Diamond G, Chonette D (August 1970). "Catheterization of the heart in man with use of a flow-directed balloon-tipped catheter". N. Engl. J. Med. 283 (9): 447–51.
A manufacturer (Edwards) offers some free information about the PA catheter on their product page.
The PA catheter section from The ICU Book by Paul L Marino (3rd edition, 2007) is a valuable read.
Additionally, UpToDate has an article on PA catheter positioning. They, in turn, reference an article from Lung, which I cannot provide a full-text link to.
Summerhill EM, Baram M. Principles of pulmonary artery catheterization in the critically ill. Lung 2005; 183:209.
Awad, Hamdy, et al. "Inadvertent placement of a pulmonary artery catheter in the coronary sinus: is it time to increase our sweep speed?." Journal of clinical anesthesia 23.6 (2011): 492-497.
Safwat, Amira M. "Difficult flotation of a pulmonary artery catheter: echocardiographic diagnosis." Journal of clinical anesthesia 13.3 (2001): 239.
Lai, Y. C., et al. "Difficult pulmonary artery catheterization in a patient with persistent left superior vena cava." Anaesthesia and intensive care 26.6 (1998): 671-673.