Pai-Dhungat, J VParikh, Falguni2003-09-092009-05-312003-09-092009-05-312003-09-09Pai-Dhungat JV, Parikh F. H.L. Helmholtz (1821-1894) postal stamp released in West Berlin--1971 in Germany--1994. Journal of the Association of Physicians of India. 2003 Sep; 51(): 886http://imsear.searo.who.int/handle/123456789/93907engGermanyGermany, WestHistory, 19th CenturyHumansOptics and Photonics --historyPhilatelyPhysics --historyPhysiology --historyBiography