| Inventory management at service facilities for systems with arbitrarily distributed service times O Berman, KP Sapna Stochastic Models 16 (3-4), 343-360, 2000 | 167 | 2000 |
| Continuous review (s, S) inventory system with random lifetimes and positive leadtimes S Kalpakam, KP Sapna Operations Research Letters 16 (2), 115-119, 1994 | 117 | 1994 |
| An (s, Q) Markovian inventory system with lost sales and two demand classes KPS Isotupa Mathematical and computer modelling 43 (7-8), 687-694, 2006 | 96 | 2006 |
| Optimal control of service for facilities holding inventory O Berman, KP Sapna Computers & Operations Research 28 (5), 429-441, 2001 | 91 | 2001 |
| Optimal service rates of a service facility with perishable inventory items O Berman, KP Sapna Naval Research Logistics (NRL) 49 (5), 464-482, 2002 | 83 | 2002 |
| A lost sales (S—1, S) perishable inventory system with renewal demand S Kalpakam, KP Sapna Naval Research Logistics (NRL) 43 (1), 129-142, 1996 | 58 | 1996 |
| An M/PH/k retrial queue with finite number of sources AS Alfa, KPS Isotupa Computers & Operations Research 31 (9), 1455-1464, 2004 | 51 | 2004 |
| Optimal management of cross-trained workers in services with negligible switching costs O Berman, J Wang, KP Sapna European Journal of Operational Research 167 (2), 349-369, 2005 | 39 | 2005 |
| Cost analysis of an (S−1,S) inventory system with two demand classes and rationing KP Sapna Isotupa Annals of Operations Research 233, 411-421, 2015 | 37 | 2015 |
| (S− 1, S) Perishable systems with stochastic leadtimes S Kalpakam, KP Sapna Mathematical and computer modelling 21 (6), 95-104, 1995 | 35 | 1995 |
| An infinite-phase quasi-birth-and-death model for the non-preemptive priority M/PH/1 queue KPS Isotupa, DA Stanford Taylor & Francis Group 18 (3), 387-424, 2002 | 31* | 2002 |
| A continuous review (s, Q) inventory system with priority customers and arbitrarily distributed lead times KPS Isotupa, SK Samanta Mathematical and computer modelling 57 (5-6), 1259-1269, 2013 | 30 | 2013 |
| An (s, Q) inventory system with two classes of customers KPS Isotupa International Journal of Operational Research 12 (1), 1-19, 2011 | 26 | 2011 |
| An (s. S) Perishable System With Arbitrarily Distributed Leadetimes S Kalpakam, KP Sapna OPSEARCH-NEW DELHI- 33, 1-19, 1996 | 24* | 1996 |
| Scheduling commercial vehicle queues at a Canada–US border crossing M Haughton, KPS Isotupa Transportation Research Part E: Logistics and Transportation Review 48 (1 …, 2012 | 21 | 2012 |
| Optimal control of servers in front and back rooms with correlated work O Berman, KP Sapna-Isotupa IIE Transactions 37 (2), 167-173, 2005 | 20 | 2005 |
| A lost sales inventory system with supply uncertainty S Kalpakam, KP Sapna Computers & Mathematics with Applications 33 (3), 81-93, 1997 | 19 | 1997 |
| A control policy of an inventory system with compound Poisson demand S Kalpakam, KP Sapna Stochastic Analysis and Applications 11 (4), 459-482, 1993 | 11 | 1993 |
| Flow control in capacity-constrained queueing systems with non-stationary arrivals M Haughton, KPS Isotupa Journal of the Operational Research Society 64 (2), 283-292, 2013 | 10 | 2013 |
| A two reorder level inventory system with renewal demands S Kalpakam, KP Sapna European journal of operational research 84 (2), 402-415, 1995 | 9 | 1995 |
