TY - BOOK ID - 139990459 TI - Lasers and excited states of rare earths AU - Reisfeld, Renata AU - Jà¸rgensen, Christian K. PY - 1977 PB - Berlin, Heidelberg, New York Springer DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:139990459 AB - ER -