@article{2015MNRAS.448.3132D, title = {The binary fraction of planetary nebula central stars - II. A larger sample and improved technique for the infrared excess search}, author = {{Douchin}, D. and {De Marco}, O. and {Frew}, D.~J. and {Jacoby}, G.~H. and {Jasniewicz}, G. and {Fitzgerald}, M. and {Passy}, J.-C. and {Harmer}, D. and {Hillwig}, T. and {Moe}, M.}, journal = {Monthly Notices of the Royal Astronomical Society}, volume = {448}, pages = {3132-3155}, year = {2015}, doi = {10.1093/mnras/stu2700} }