- Belessiotis V., "Methods of test for the thermal performance of liquid heating solar collectors". Proposal for standard ELOT 388.1 + 2, Center for Renewable Energy Sources Greece, April 1990.
- Belessiotis V., "Qualification tests for flat plate solar collectors", proposal for ELOT standard, Hellenic Center for Productivity (EL.KE.PA.), Greece, 1989.
- Belessiotis V., "Solar energy - Domestic water solar heating systems: Procedure for system performance characterization and yearly performance prediction". Proposal for ELOT 879 Standard, Hellenic Center for Productivity (EL.KE.PA.), Greece, 1989.
- Pafelias T.A. and Belessiotis V., "Qualification tests of commercial solar collectors, Tests according to Standard ELOT 388.3, Evaluation of results and conclusions", CRES, Vol. A, June 1991 (in Greek).