1990

H. Kooijman, L.M.J. Kroon-Batenburg, J. Kroon, J.N. Breg and J.L. de Boer: Structure of $\alpha$-D-N-Acetyl-1-O-methylneuraminic Acid Methyl Ester. Acta Crystallogr. C46 (1990) 407-410.

J. Kroon, R.L. Scherrenberg, H. Kooijman and J.A. Kanters: The hydrogen-atom environment of the ether oxygen atom in crystal structures of some representative muscarinic agonists. J. Mol. Struct. 223 (1990) 287-290.

Huub Kooijman, Jan A. Kanters and Jan Kroon: Molecular mechanics calculations on muscarinic agonists. J. Mol. Struct. 238 (1990) 253-271.