Stochastic modelling of a system having two non-identical class of units.Published in:Journal of Ultra Scientist of Physical Sciences - Section A (Mathematics), 2022, v. 34, n. 6, p. 1, doi. 10.22147/jusps-A/340601By:SHRIVASTAVA, PRAVEEN KUMAR;SINGH, SATYENDRA PRASAD;SINGH, S. K.Publication type:Article