The generation of entangled photon pairs by type-II sources and typical experiments are described in the following scientific papers:

• P. G. Kwiat, et al. “New high-intensity source of polarizationentangled photon pairs,” Phys. Rev. Lett. 75, 4337 (1995).
• J. Volz, et al. “Compact all-solid-state source of polarizationentangled photon pairs,” Appl. Phys. Lett. 79, 869 (2001).
• P. Trojek, et al. "Compact source of polarization-entangled photon pairs," Opt. Express 12, 276 (2004).

• M. Aspelmeyer, et al. “Long-Distance Free-Space Distribution of Quantum Entanglement,” Science 301, 621 (2003).
• K. Resch, et al. "Distributing entanglement and single photons through an intra-city, free-space quantum channel," Opt. Express 13, 202 (2005).

• A. Poppe, et al. "Practical quantum key distribution with polarization entangled photons," Opt. Express 12, 3865 (2004).

• S. Gröblacher, et al. “An experimental test of non-local realism,” Nature 446, 871 (2007).