求助论文两个

1.  Azzalini， A class of distributions which includes the normal ones, Scandinavion journal of statistics, 12, 171-178, 1985.

2. Yu, K. & Jones, M. C. (2004). Likelihood-based local linear estimation of the conditional variance function. J. Amer. Statist. Assoc. 99, 139-144.

Likelihood-based local linear estimation of the conditional variance function

第一篇，第二篇我没有权限。