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- [21] 50 PER CENT SODIUM DIATRIZOATE FOR SELECTIVE ANGIOCARDIOGRAPHY IN INFANTSANGIOLOGY, 1967, 18 (03) : 150 - &ALTMAN, ARKAHN, REBORRELLI, FJ
- [22] 50 PER CENT SURVIVAL TIME AS A MEASURE OF PROGNOSIS IN CANCERAMERICAN JOURNAL OF CLINICAL PATHOLOGY, 1956, 26 (02) : 172 - 174SCHREK, R
- [23] A table determining LD 50 or the fifty per cent endpointPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1943, 29 : 207 - 212Worcester, JWilson, EB
- [24] PHASE DIAGRAM FOR 1 PER CENT CARBON-IRON ALLOYS CONTAINING UP TO 16 PER CENT NICKELNATURE, 1955, 175 (4444) : 37 - 38SAMUEL, PFINCH, LGRAIT, JR
- [25] A weight per cent-mol per cent nomographINDUSTRIAL AND ENGINEERING CHEMISTRY, 1931, 23 : 803 - 803Waterman, H
- [27] Web-delivered engineering resource speeds design of airframe surface features by up to 50 per centAIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, 2001, 73 (01): : 60 - 61不详
- [28] ON MAGNETIC STABILITY OF SOFT MAGNETIC 50 PER CENT AND 27 PER CENT CO IRON-COBALT ALLOYS AT ELEVATED TEMPERATURESTECHNISCHE MITTEILUNGEN KRUPP FORSCHUNGSBERICHTE, 1967, 25 (1-2): : 17 - &FAHLENBR.HBRETTHAU.KMICHEL, W
