Parallel two-step phase-shifting point-diffraction interferometry for microscopy based on a pair of cube beamsplitters - Peng, Gao; Yao, Baoli; Min, Junwei; Harder, Irina; Nercissian, Vanusch; Mantel, Klaus; Guo, Rongli; Zheng, Juanjuan; Ye, Tong (Optics Express, 2011)