//! PM3 (Parameterized Model 3) semi-empirical method.
//!
//! Implements the NDDO (Neglect of Diatomic Differential Overlap) approximation
//! with Stewart's PM3 parameterization for common organic elements.
//!
//! Reference: Stewart, J. J. P. "Optimization of Parameters for Semiempirical Methods I.
//! Method," J. Comput. Chem. 10 (1989): 209–220.
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