Cioslowski, Jerzy Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
https://aip.scitation.org/doi/10.1063/1.4958638 (Publisher version)
Cioslowski, J. (2016). Note: An explicit solution of the optimal superposition and Eckart frame problems. The Journal of Chemical Physics, 145(2): 026102. doi:10.1063/1.4958638.