Simple-minded estimate of the masses of baryons containing single heavy   quarks
  The masses of the yet undiscovered baryons containing single $c$ or $b$ quarks are estimated from the known masses using the following rules: equal distances in mass between the isomultiplets forming sextets, equal mass differences between the corresponding spin one-half baryons containing $c$ and $b$ quarks, hyperfine splittings inversely proportional to the masses of the heavy quarks. 
Agnieszka Zalewska (Institute of Nuclear Physics, Krak\'ow) and Kacper   Zalewski (Jagellonian University and Institute of N...