Amparo Gil Javier Segura Nico M. Temme Algorithm 850: Real parabolic cylinder functions <i>U</i>(<i>a</i>, <i>x</i>), <i>V</i>(<i>a</i>, <i>x</i>). 102-112 2006 32 ACM Trans. Math. Softw. 1 http://doi.acm.org/10.1145/1132973.1132978 db/journals/toms/toms32.html#GilST06a