X-ray crystallography is by far the most widely used method to determine atomic-resolution structures of biopolymers but is limited to samples that form well-ordered, three-dimensional crystals.

This paper presents new models for simultaneous relationships among endogenous categorical variables. Previous investigators have argued that the loglinear/logit framework is insufficiently rich for ...

The American Economist, Vol. 42, No. 1 (Spring, 1998), pp. 42-55 (14 pages) This paper investigates rivalry in R&D expenditures for firms within the U. S. Automobile industry. It attempts to falsify ...