@article { JaklJOPAA07,
	title = {Axial optical trap stiffness influenced by retro-reflected beam},
	journal = {J. Opt. A: Pure Appl. Opt.},
	volume = {9},
	number = {8, Sp. Iss. SI},
	year = {2007},
	pages = {S251{\textendash}S255},
	issn = {1464-4258},
	doi = {10.1088/1464-4258/9/8/S19}
}
