Media 1: Parallel two-step phase-shifting point-diffraction interferometry for microscopy based on a pair of cube beamsplitters GaoPeng YaoBaoli MinJunwei GuoRongli ZhengJuanjuan YeTong HarderIrina NercissianVanusch MantelKlaus 2011 Originally published in Optics Express on 31 January 2011 (oe-19-3-1930)